net/batman-adv/translation-table.c

   1 /* Copyright (C) 2007-2016  B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich, Antonio Quartulli
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "translation-table.h"
  19 #include "main.h"
  20
  21 #include <linux/atomic.h>
  22 #include <linux/bitops.h>
  23 #include <linux/bug.h>
  24 #include <linux/byteorder/generic.h>
  25 #include <linux/compiler.h>
  26 #include <linux/crc32c.h>
  27 #include <linux/errno.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/fs.h>
  30 #include <linux/if_ether.h>
  31 #include <linux/jhash.h>
  32 #include <linux/jiffies.h>
  33 #include <linux/kernel.h>
  34 #include <linux/list.h>
  35 #include <linux/lockdep.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/rculist.h>
  38 #include <linux/rcupdate.h>
  39 #include <linux/seq_file.h>
  40 #include <linux/slab.h>
  41 #include <linux/spinlock.h>
  42 #include <linux/stddef.h>
  43 #include <linux/string.h>
  44 #include <linux/workqueue.h>
  45 #include <net/net_namespace.h>
  46
  47 #include "bridge_loop_avoidance.h"
  48 #include "hard-interface.h"
  49 #include "hash.h"
  50 #include "multicast.h"
  51 #include "originator.h"
  52 #include "packet.h"
  53 #include "soft-interface.h"
  54
  55 /* hash class keys */
  56 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
  57 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
  58
  59 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
  60                                  unsigned short vid,
  61                                  struct batadv_orig_node *orig_node);
  62 static void batadv_tt_purge(struct work_struct *work);
  63 static void
  64 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  65 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  66                                  struct batadv_orig_node *orig_node,
  67                                  const unsigned char *addr,
  68                                  unsigned short vid, const char *message,
  69                                  bool roaming);
  70
  71 /**
  72  * batadv_compare_tt - check if two TT entries are the same
  73  * @node: the list element pointer of the first TT entry
  74  * @data2: pointer to the tt_common_entry of the second TT entry
  75  *
  76  * Compare the MAC address and the VLAN ID of the two TT entries and check if
  77  * they are the same TT client.
  78  * Return: 1 if the two TT clients are the same, 0 otherwise
  79  */
  80 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
  81 {
  82         const void *data1 = container_of(node, struct batadv_tt_common_entry,
  83                                          hash_entry);
  84         const struct batadv_tt_common_entry *tt1 = data1;
  85         const struct batadv_tt_common_entry *tt2 = data2;
  86
  87         return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
  88 }
  89
  90 /**
  91  * batadv_choose_tt - return the index of the tt entry in the hash table
  92  * @data: pointer to the tt_common_entry object to map
  93  * @size: the size of the hash table
  94  *
  95  * Return: the hash index where the object represented by 'data' should be
  96  * stored at.
  97  */
  98 static inline u32 batadv_choose_tt(const void *data, u32 size)
  99 {
 100         struct batadv_tt_common_entry *tt;
 101         u32 hash = 0;
 102
 103         tt = (struct batadv_tt_common_entry *)data;
 104         hash = jhash(&tt->addr, ETH_ALEN, hash);
 105         hash = jhash(&tt->vid, sizeof(tt->vid), hash);
 106
 107         return hash % size;
 108 }
 109
 110 /**
 111  * batadv_tt_hash_find - look for a client in the given hash table
 112  * @hash: the hash table to search
 113  * @addr: the mac address of the client to look for
 114  * @vid: VLAN identifier
 115  *
 116  * Return: a pointer to the tt_common struct belonging to the searched client if
 117  * found, NULL otherwise.
 118  */
 119 static struct batadv_tt_common_entry *
 120 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
 121                     unsigned short vid)
 122 {
 123         struct hlist_head *head;
 124         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
 125         u32 index;
 126
 127         if (!hash)
 128                 return NULL;
 129
 130         ether_addr_copy(to_search.addr, addr);
 131         to_search.vid = vid;
 132
 133         index = batadv_choose_tt(&to_search, hash->size);
 134         head = &hash->table[index];
 135
 136         rcu_read_lock();
 137         hlist_for_each_entry_rcu(tt, head, hash_entry) {
 138                 if (!batadv_compare_eth(tt, addr))
 139                         continue;
 140
 141                 if (tt->vid != vid)
 142                         continue;
 143
 144                 if (!atomic_inc_not_zero(&tt->refcount))
 145                         continue;
 146
 147                 tt_tmp = tt;
 148                 break;
 149         }
 150         rcu_read_unlock();
 151
 152         return tt_tmp;
 153 }
 154
 155 /**
 156  * batadv_tt_local_hash_find - search the local table for a given client
 157  * @bat_priv: the bat priv with all the soft interface information
 158  * @addr: the mac address of the client to look for
 159  * @vid: VLAN identifier
 160  *
 161  * Return: a pointer to the corresponding tt_local_entry struct if the client is
 162  * found, NULL otherwise.
 163  */
 164 static struct batadv_tt_local_entry *
 165 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 166                           unsigned short vid)
 167 {
 168         struct batadv_tt_common_entry *tt_common_entry;
 169         struct batadv_tt_local_entry *tt_local_entry = NULL;
 170
 171         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
 172                                               vid);
 173         if (tt_common_entry)
 174                 tt_local_entry = container_of(tt_common_entry,
 175                                               struct batadv_tt_local_entry,
 176                                               common);
 177         return tt_local_entry;
 178 }
 179
 180 /**
 181  * batadv_tt_global_hash_find - search the global table for a given client
 182  * @bat_priv: the bat priv with all the soft interface information
 183  * @addr: the mac address of the client to look for
 184  * @vid: VLAN identifier
 185  *
 186  * Return: a pointer to the corresponding tt_global_entry struct if the client
 187  * is found, NULL otherwise.
 188  */
 189 static struct batadv_tt_global_entry *
 190 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 191                            unsigned short vid)
 192 {
 193         struct batadv_tt_common_entry *tt_common_entry;
 194         struct batadv_tt_global_entry *tt_global_entry = NULL;
 195
 196         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
 197                                               vid);
 198         if (tt_common_entry)
 199                 tt_global_entry = container_of(tt_common_entry,
 200                                                struct batadv_tt_global_entry,
 201                                                common);
 202         return tt_global_entry;
 203 }
 204
 205 static void
 206 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
 207 {
 208         if (atomic_dec_and_test(&tt_local_entry->common.refcount))
 209                 kfree_rcu(tt_local_entry, common.rcu);
 210 }
 211
 212 /**
 213  * batadv_tt_global_entry_free_ref - decrement the refcounter for a
 214  *  tt_global_entry and possibly free it
 215  * @tt_global_entry: the object to free
 216  */
 217 static void
 218 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
 219 {
 220         if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
 221                 batadv_tt_global_del_orig_list(tt_global_entry);
 222                 kfree_rcu(tt_global_entry, common.rcu);
 223         }
 224 }
 225
 226 /**
 227  * batadv_tt_global_hash_count - count the number of orig entries
 228  * @bat_priv: the bat priv with all the soft interface information
 229  * @addr: the mac address of the client to count entries for
 230  * @vid: VLAN identifier
 231  *
 232  * Return: the number of originators advertising the given address/data
 233  * (excluding ourself).
 234  */
 235 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
 236                                 const u8 *addr, unsigned short vid)
 237 {
 238         struct batadv_tt_global_entry *tt_global_entry;
 239         int count;
 240
 241         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
 242         if (!tt_global_entry)
 243                 return 0;
 244
 245         count = atomic_read(&tt_global_entry->orig_list_count);
 246         batadv_tt_global_entry_free_ref(tt_global_entry);
 247
 248         return count;
 249 }
 250
 251 /**
 252  * batadv_tt_local_size_mod - change the size by v of the local table identified
 253  *  by vid
 254  * @bat_priv: the bat priv with all the soft interface information
 255  * @vid: the VLAN identifier of the sub-table to change
 256  * @v: the amount to sum to the local table size
 257  */
 258 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
 259                                      unsigned short vid, int v)
 260 {
 261         struct batadv_softif_vlan *vlan;
 262
 263         vlan = batadv_softif_vlan_get(bat_priv, vid);
 264         if (!vlan)
 265                 return;
 266
 267         atomic_add(v, &vlan->tt.num_entries);
 268
 269         batadv_softif_vlan_free_ref(vlan);
 270 }
 271
 272 /**
 273  * batadv_tt_local_size_inc - increase by one the local table size for the given
 274  *  vid
 275  * @bat_priv: the bat priv with all the soft interface information
 276  * @vid: the VLAN identifier
 277  */
 278 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
 279                                      unsigned short vid)
 280 {
 281         batadv_tt_local_size_mod(bat_priv, vid, 1);
 282 }
 283
 284 /**
 285  * batadv_tt_local_size_dec - decrease by one the local table size for the given
 286  *  vid
 287  * @bat_priv: the bat priv with all the soft interface information
 288  * @vid: the VLAN identifier
 289  */
 290 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
 291                                      unsigned short vid)
 292 {
 293         batadv_tt_local_size_mod(bat_priv, vid, -1);
 294 }
 295
 296 /**
 297  * batadv_tt_global_size_mod - change the size by v of the global table
 298  *  for orig_node identified by vid
 299  * @orig_node: the originator for which the table has to be modified
 300  * @vid: the VLAN identifier
 301  * @v: the amount to sum to the global table size
 302  */
 303 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
 304                                       unsigned short vid, int v)
 305 {
 306         struct batadv_orig_node_vlan *vlan;
 307
 308         vlan = batadv_orig_node_vlan_new(orig_node, vid);
 309         if (!vlan)
 310                 return;
 311
 312         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
 313                 spin_lock_bh(&orig_node->vlan_list_lock);
 314                 hlist_del_init_rcu(&vlan->list);
 315                 spin_unlock_bh(&orig_node->vlan_list_lock);
 316                 batadv_orig_node_vlan_free_ref(vlan);
 317         }
 318
 319         batadv_orig_node_vlan_free_ref(vlan);
 320 }
 321
 322 /**
 323  * batadv_tt_global_size_inc - increase by one the global table size for the
 324  *  given vid
 325  * @orig_node: the originator which global table size has to be decreased
 326  * @vid: the vlan identifier
 327  */
 328 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
 329                                       unsigned short vid)
 330 {
 331         batadv_tt_global_size_mod(orig_node, vid, 1);
 332 }
 333
 334 /**
 335  * batadv_tt_global_size_dec - decrease by one the global table size for the
 336  *  given vid
 337  * @orig_node: the originator which global table size has to be decreased
 338  * @vid: the vlan identifier
 339  */
 340 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 341                                       unsigned short vid)
 342 {
 343         batadv_tt_global_size_mod(orig_node, vid, -1);
 344 }
 345
 346 /**
 347  * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
 348  *  queue for free after rcu grace period
 349  * @orig_entry: tt orig entry to be free'd
 350  */
 351 static void
 352 batadv_tt_orig_list_entry_release(struct batadv_tt_orig_list_entry *orig_entry)
 353 {
 354         batadv_orig_node_free_ref(orig_entry->orig_node);
 355         kfree_rcu(orig_entry, rcu);
 356 }
 357
 358 static void
 359 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
 360 {
 361         if (!atomic_dec_and_test(&orig_entry->refcount))
 362                 return;
 363
 364         batadv_tt_orig_list_entry_release(orig_entry);
 365 }
 366
 367 /**
 368  * batadv_tt_local_event - store a local TT event (ADD/DEL)
 369  * @bat_priv: the bat priv with all the soft interface information
 370  * @tt_local_entry: the TT entry involved in the event
 371  * @event_flags: flags to store in the event structure
 372  */
 373 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 374                                   struct batadv_tt_local_entry *tt_local_entry,
 375                                   u8 event_flags)
 376 {
 377         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 378         struct batadv_tt_common_entry *common = &tt_local_entry->common;
 379         u8 flags = common->flags | event_flags;
 380         bool event_removed = false;
 381         bool del_op_requested, del_op_entry;
 382
 383         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
 384         if (!tt_change_node)
 385                 return;
 386
 387         tt_change_node->change.flags = flags;
 388         memset(tt_change_node->change.reserved, 0,
 389                sizeof(tt_change_node->change.reserved));
 390         ether_addr_copy(tt_change_node->change.addr, common->addr);
 391         tt_change_node->change.vid = htons(common->vid);
 392
 393         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 394
 395         /* check for ADD+DEL or DEL+ADD events */
 396         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 397         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 398                                  list) {
 399                 if (!batadv_compare_eth(entry->change.addr, common->addr))
 400                         continue;
 401
 402                 /* DEL+ADD in the same orig interval have no effect and can be
 403                  * removed to avoid silly behaviour on the receiver side. The
 404                  * other way around (ADD+DEL) can happen in case of roaming of
 405                  * a client still in the NEW state. Roaming of NEW clients is
 406                  * now possible due to automatically recognition of "temporary"
 407                  * clients
 408                  */
 409                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 410                 if (!del_op_requested && del_op_entry)
 411                         goto del;
 412                 if (del_op_requested && !del_op_entry)
 413                         goto del;
 414
 415                 /* this is a second add in the same originator interval. It
 416                  * means that flags have been changed: update them!
 417                  */
 418                 if (!del_op_requested && !del_op_entry)
 419                         entry->change.flags = flags;
 420
 421                 continue;
 422 del:
 423                 list_del(&entry->list);
 424                 kfree(entry);
 425                 kfree(tt_change_node);
 426                 event_removed = true;
 427                 goto unlock;
 428         }
 429
 430         /* track the change in the OGMinterval list */
 431         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 432
 433 unlock:
 434         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 435
 436         if (event_removed)
 437                 atomic_dec(&bat_priv->tt.local_changes);
 438         else
 439                 atomic_inc(&bat_priv->tt.local_changes);
 440 }
 441
 442 /**
 443  * batadv_tt_len - compute length in bytes of given number of tt changes
 444  * @changes_num: number of tt changes
 445  *
 446  * Return: computed length in bytes.
 447  */
 448 static int batadv_tt_len(int changes_num)
 449 {
 450         return changes_num * sizeof(struct batadv_tvlv_tt_change);
 451 }
 452
 453 /**
 454  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
 455  * @tt_len: available space
 456  *
 457  * Return: the number of entries.
 458  */
 459 static u16 batadv_tt_entries(u16 tt_len)
 460 {
 461         return tt_len / batadv_tt_len(1);
 462 }
 463
 464 /**
 465  * batadv_tt_local_table_transmit_size - calculates the local translation table
 466  *  size when transmitted over the air
 467  * @bat_priv: the bat priv with all the soft interface information
 468  *
 469  * Return: local translation table size in bytes.
 470  */
 471 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
 472 {
 473         u16 num_vlan = 0;
 474         u16 tt_local_entries = 0;
 475         struct batadv_softif_vlan *vlan;
 476         int hdr_size;
 477
 478         rcu_read_lock();
 479         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 480                 num_vlan++;
 481                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
 482         }
 483         rcu_read_unlock();
 484
 485         /* header size of tvlv encapsulated tt response payload */
 486         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
 487         hdr_size += sizeof(struct batadv_tvlv_hdr);
 488         hdr_size += sizeof(struct batadv_tvlv_tt_data);
 489         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
 490
 491         return hdr_size + batadv_tt_len(tt_local_entries);
 492 }
 493
 494 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 495 {
 496         if (bat_priv->tt.local_hash)
 497                 return 0;
 498
 499         bat_priv->tt.local_hash = batadv_hash_new(1024);
 500
 501         if (!bat_priv->tt.local_hash)
 502                 return -ENOMEM;
 503
 504         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
 505                                    &batadv_tt_local_hash_lock_class_key);
 506
 507         return 0;
 508 }
 509
 510 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 511                                   struct batadv_tt_global_entry *tt_global,
 512                                   const char *message)
 513 {
 514         batadv_dbg(BATADV_DBG_TT, bat_priv,
 515                    "Deleting global tt entry %pM (vid: %d): %s\n",
 516                    tt_global->common.addr,
 517                    BATADV_PRINT_VID(tt_global->common.vid), message);
 518
 519         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 520                            batadv_choose_tt, &tt_global->common);
 521         batadv_tt_global_entry_free_ref(tt_global);
 522 }
 523
 524 /**
 525  * batadv_tt_local_add - add a new client to the local table or update an
 526  *  existing client
 527  * @soft_iface: netdev struct of the mesh interface
 528  * @addr: the mac address of the client to add
 529  * @vid: VLAN identifier
 530  * @ifindex: index of the interface where the client is connected to (useful to
 531  *  identify wireless clients)
 532  * @mark: the value contained in the skb->mark field of the received packet (if
 533  *  any)
 534  *
 535  * Return: true if the client was successfully added, false otherwise.
 536  */
 537 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
 538                          unsigned short vid, int ifindex, u32 mark)
 539 {
 540         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 541         struct batadv_tt_local_entry *tt_local;
 542         struct batadv_tt_global_entry *tt_global = NULL;
 543         struct batadv_softif_vlan *vlan;
 544         struct net_device *in_dev = NULL;
 545         struct hlist_head *head;
 546         struct batadv_tt_orig_list_entry *orig_entry;
 547         int hash_added, table_size, packet_size_max;
 548         bool ret = false;
 549         bool roamed_back = false;
 550         u8 remote_flags;
 551         u32 match_mark;
 552
 553         if (ifindex != BATADV_NULL_IFINDEX)
 554                 in_dev = dev_get_by_index(&init_net, ifindex);
 555
 556         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
 557
 558         if (!is_multicast_ether_addr(addr))
 559                 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 560
 561         if (tt_local) {
 562                 tt_local->last_seen = jiffies;
 563                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
 564                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 565                                    "Re-adding pending client %pM (vid: %d)\n",
 566                                    addr, BATADV_PRINT_VID(vid));
 567                         /* whatever the reason why the PENDING flag was set,
 568                          * this is a client which was enqueued to be removed in
 569                          * this orig_interval. Since it popped up again, the
 570                          * flag can be reset like it was never enqueued
 571                          */
 572                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
 573                         goto add_event;
 574                 }
 575
 576                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 577                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 578                                    "Roaming client %pM (vid: %d) came back to its original location\n",
 579                                    addr, BATADV_PRINT_VID(vid));
 580                         /* the ROAM flag is set because this client roamed away
 581                          * and the node got a roaming_advertisement message. Now
 582                          * that the client popped up again at its original
 583                          * location such flag can be unset
 584                          */
 585                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 586                         roamed_back = true;
 587                 }
 588                 goto check_roaming;
 589         }
 590
 591         /* Ignore the client if we cannot send it in a full table response. */
 592         table_size = batadv_tt_local_table_transmit_size(bat_priv);
 593         table_size += batadv_tt_len(1);
 594         packet_size_max = atomic_read(&bat_priv->packet_size_max);
 595         if (table_size > packet_size_max) {
 596                 net_ratelimited_function(batadv_info, soft_iface,
 597                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
 598                                          table_size, packet_size_max, addr);
 599                 goto out;
 600         }
 601
 602         tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
 603         if (!tt_local)
 604                 goto out;
 605
 606         /* increase the refcounter of the related vlan */
 607         vlan = batadv_softif_vlan_get(bat_priv, vid);
 608         if (WARN(!vlan, "adding TT local entry %pM to non-existent VLAN %d",
 609                  addr, BATADV_PRINT_VID(vid))) {
 610                 kfree(tt_local);
 611                 tt_local = NULL;
 612                 goto out;
 613         }
 614
 615         batadv_dbg(BATADV_DBG_TT, bat_priv,
 616                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
 617                    addr, BATADV_PRINT_VID(vid),
 618                    (u8)atomic_read(&bat_priv->tt.vn));
 619
 620         ether_addr_copy(tt_local->common.addr, addr);
 621         /* The local entry has to be marked as NEW to avoid to send it in
 622          * a full table response going out before the next ttvn increment
 623          * (consistency check)
 624          */
 625         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
 626         tt_local->common.vid = vid;
 627         if (batadv_is_wifi_netdev(in_dev))
 628                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 629         atomic_set(&tt_local->common.refcount, 2);
 630         tt_local->last_seen = jiffies;
 631         tt_local->common.added_at = tt_local->last_seen;
 632
 633         /* the batman interface mac and multicast addresses should never be
 634          * purged
 635          */
 636         if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
 637             is_multicast_ether_addr(addr))
 638                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 639
 640         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 641                                      batadv_choose_tt, &tt_local->common,
 642                                      &tt_local->common.hash_entry);
 643
 644         if (unlikely(hash_added != 0)) {
 645                 /* remove the reference for the hash */
 646                 batadv_tt_local_entry_free_ref(tt_local);
 647                 batadv_softif_vlan_free_ref(vlan);
 648                 goto out;
 649         }
 650
 651 add_event:
 652         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 653
 654 check_roaming:
 655         /* Check whether it is a roaming, but don't do anything if the roaming
 656          * process has already been handled
 657          */
 658         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
 659                 /* These node are probably going to update their tt table */
 660                 head = &tt_global->orig_list;
 661                 rcu_read_lock();
 662                 hlist_for_each_entry_rcu(orig_entry, head, list) {
 663                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
 664                                              tt_global->common.vid,
 665                                              orig_entry->orig_node);
 666                 }
 667                 rcu_read_unlock();
 668                 if (roamed_back) {
 669                         batadv_tt_global_free(bat_priv, tt_global,
 670                                               "Roaming canceled");
 671                         tt_global = NULL;
 672                 } else {
 673                         /* The global entry has to be marked as ROAMING and
 674                          * has to be kept for consistency purpose
 675                          */
 676                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
 677                         tt_global->roam_at = jiffies;
 678                 }
 679         }
 680
 681         /* store the current remote flags before altering them. This helps
 682          * understanding is flags are changing or not
 683          */
 684         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
 685
 686         if (batadv_is_wifi_netdev(in_dev))
 687                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 688         else
 689                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
 690
 691         /* check the mark in the skb: if it's equal to the configured
 692          * isolation_mark, it means the packet is coming from an isolated
 693          * non-mesh client
 694          */
 695         match_mark = (mark & bat_priv->isolation_mark_mask);
 696         if (bat_priv->isolation_mark_mask &&
 697             match_mark == bat_priv->isolation_mark)
 698                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
 699         else
 700                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
 701
 702         /* if any "dynamic" flag has been modified, resend an ADD event for this
 703          * entry so that all the nodes can get the new flags
 704          */
 705         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
 706                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 707
 708         ret = true;
 709 out:
 710         if (in_dev)
 711                 dev_put(in_dev);
 712         if (tt_local)
 713                 batadv_tt_local_entry_free_ref(tt_local);
 714         if (tt_global)
 715                 batadv_tt_global_entry_free_ref(tt_global);
 716         return ret;
 717 }
 718
 719 /**
 720  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
 721  *  within a TT Response directed to another node
 722  * @orig_node: originator for which the TT data has to be prepared
 723  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 724  * @tt_change: uninitialised pointer to the address of the area where the TT
 725  *  changed can be stored
 726  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 727  *  function reserves the amount of space needed to send the entire global TT
 728  *  table. In case of success the value is updated with the real amount of
 729  *  reserved bytes
 730  * Allocate the needed amount of memory for the entire TT TVLV and write its
 731  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 732  * objects, one per active VLAN served by the originator node.
 733  *
 734  * Return: the size of the allocated buffer or 0 in case of failure.
 735  */
 736 static u16
 737 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 738                                    struct batadv_tvlv_tt_data **tt_data,
 739                                    struct batadv_tvlv_tt_change **tt_change,
 740                                    s32 *tt_len)
 741 {
 742         u16 num_vlan = 0;
 743         u16 num_entries = 0;
 744         u16 change_offset;
 745         u16 tvlv_len;
 746         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 747         struct batadv_orig_node_vlan *vlan;
 748         u8 *tt_change_ptr;
 749
 750         rcu_read_lock();
 751         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 752                 num_vlan++;
 753                 num_entries += atomic_read(&vlan->tt.num_entries);
 754         }
 755
 756         change_offset = sizeof(**tt_data);
 757         change_offset += num_vlan * sizeof(*tt_vlan);
 758
 759         /* if tt_len is negative, allocate the space needed by the full table */
 760         if (*tt_len < 0)
 761                 *tt_len = batadv_tt_len(num_entries);
 762
 763         tvlv_len = *tt_len;
 764         tvlv_len += change_offset;
 765
 766         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 767         if (!*tt_data) {
 768                 *tt_len = 0;
 769                 goto out;
 770         }
 771
 772         (*tt_data)->flags = BATADV_NO_FLAGS;
 773         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
 774         (*tt_data)->num_vlan = htons(num_vlan);
 775
 776         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 777         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 778                 tt_vlan->vid = htons(vlan->vid);
 779                 tt_vlan->crc = htonl(vlan->tt.crc);
 780
 781                 tt_vlan++;
 782         }
 783
 784         tt_change_ptr = (u8 *)*tt_data + change_offset;
 785         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 786
 787 out:
 788         rcu_read_unlock();
 789         return tvlv_len;
 790 }
 791
 792 /**
 793  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
 794  *  node
 795  * @bat_priv: the bat priv with all the soft interface information
 796  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 797  * @tt_change: uninitialised pointer to the address of the area where the TT
 798  *  changes can be stored
 799  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 800  *  function reserves the amount of space needed to send the entire local TT
 801  *  table. In case of success the value is updated with the real amount of
 802  *  reserved bytes
 803  *
 804  * Allocate the needed amount of memory for the entire TT TVLV and write its
 805  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 806  * objects, one per active VLAN.
 807  *
 808  * Return: the size of the allocated buffer or 0 in case of failure.
 809  */
 810 static u16
 811 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 812                                   struct batadv_tvlv_tt_data **tt_data,
 813                                   struct batadv_tvlv_tt_change **tt_change,
 814                                   s32 *tt_len)
 815 {
 816         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 817         struct batadv_softif_vlan *vlan;
 818         u16 num_vlan = 0;
 819         u16 num_entries = 0;
 820         u16 tvlv_len;
 821         u8 *tt_change_ptr;
 822         int change_offset;
 823
 824         rcu_read_lock();
 825         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 826                 num_vlan++;
 827                 num_entries += atomic_read(&vlan->tt.num_entries);
 828         }
 829
 830         change_offset = sizeof(**tt_data);
 831         change_offset += num_vlan * sizeof(*tt_vlan);
 832
 833         /* if tt_len is negative, allocate the space needed by the full table */
 834         if (*tt_len < 0)
 835                 *tt_len = batadv_tt_len(num_entries);
 836
 837         tvlv_len = *tt_len;
 838         tvlv_len += change_offset;
 839
 840         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 841         if (!*tt_data) {
 842                 tvlv_len = 0;
 843                 goto out;
 844         }
 845
 846         (*tt_data)->flags = BATADV_NO_FLAGS;
 847         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
 848         (*tt_data)->num_vlan = htons(num_vlan);
 849
 850         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 851         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 852                 tt_vlan->vid = htons(vlan->vid);
 853                 tt_vlan->crc = htonl(vlan->tt.crc);
 854
 855                 tt_vlan++;
 856         }
 857
 858         tt_change_ptr = (u8 *)*tt_data + change_offset;
 859         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 860
 861 out:
 862         rcu_read_unlock();
 863         return tvlv_len;
 864 }
 865
 866 /**
 867  * batadv_tt_tvlv_container_update - update the translation table tvlv container
 868  *  after local tt changes have been committed
 869  * @bat_priv: the bat priv with all the soft interface information
 870  */
 871 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 872 {
 873         struct batadv_tt_change_node *entry, *safe;
 874         struct batadv_tvlv_tt_data *tt_data;
 875         struct batadv_tvlv_tt_change *tt_change;
 876         int tt_diff_len, tt_change_len = 0;
 877         int tt_diff_entries_num = 0;
 878         int tt_diff_entries_count = 0;
 879         u16 tvlv_len;
 880
 881         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
 882         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
 883
 884         /* if we have too many changes for one packet don't send any
 885          * and wait for the tt table request which will be fragmented
 886          */
 887         if (tt_diff_len > bat_priv->soft_iface->mtu)
 888                 tt_diff_len = 0;
 889
 890         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
 891                                                      &tt_change, &tt_diff_len);
 892         if (!tvlv_len)
 893                 return;
 894
 895         tt_data->flags = BATADV_TT_OGM_DIFF;
 896
 897         if (tt_diff_len == 0)
 898                 goto container_register;
 899
 900         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 901         atomic_set(&bat_priv->tt.local_changes, 0);
 902
 903         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 904                                  list) {
 905                 if (tt_diff_entries_count < tt_diff_entries_num) {
 906                         memcpy(tt_change + tt_diff_entries_count,
 907                                &entry->change,
 908                                sizeof(struct batadv_tvlv_tt_change));
 909                         tt_diff_entries_count++;
 910                 }
 911                 list_del(&entry->list);
 912                 kfree(entry);
 913         }
 914         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 915
 916         /* Keep the buffer for possible tt_request */
 917         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
 918         kfree(bat_priv->tt.last_changeset);
 919         bat_priv->tt.last_changeset_len = 0;
 920         bat_priv->tt.last_changeset = NULL;
 921         tt_change_len = batadv_tt_len(tt_diff_entries_count);
 922         /* check whether this new OGM has no changes due to size problems */
 923         if (tt_diff_entries_count > 0) {
 924                 /* if kmalloc() fails we will reply with the full table
 925                  * instead of providing the diff
 926                  */
 927                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
 928                 if (bat_priv->tt.last_changeset) {
 929                         memcpy(bat_priv->tt.last_changeset,
 930                                tt_change, tt_change_len);
 931                         bat_priv->tt.last_changeset_len = tt_diff_len;
 932                 }
 933         }
 934         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
 935
 936 container_register:
 937         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
 938                                        tvlv_len);
 939         kfree(tt_data);
 940 }
 941
 942 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 943 {
 944         struct net_device *net_dev = (struct net_device *)seq->private;
 945         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 946         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
 947         struct batadv_tt_common_entry *tt_common_entry;
 948         struct batadv_tt_local_entry *tt_local;
 949         struct batadv_hard_iface *primary_if;
 950         struct batadv_softif_vlan *vlan;
 951         struct hlist_head *head;
 952         unsigned short vid;
 953         u32 i;
 954         int last_seen_secs;
 955         int last_seen_msecs;
 956         unsigned long last_seen_jiffies;
 957         bool no_purge;
 958         u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
 959
 960         primary_if = batadv_seq_print_text_primary_if_get(seq);
 961         if (!primary_if)
 962                 goto out;
 963
 964         seq_printf(seq,
 965                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
 966                    net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
 967         seq_printf(seq, "       %-13s  %s %-8s %-9s (%-10s)\n", "Client", "VID",
 968                    "Flags", "Last seen", "CRC");
 969
 970         for (i = 0; i < hash->size; i++) {
 971                 head = &hash->table[i];
 972
 973                 rcu_read_lock();
 974                 hlist_for_each_entry_rcu(tt_common_entry,
 975                                          head, hash_entry) {
 976                         tt_local = container_of(tt_common_entry,
 977                                                 struct batadv_tt_local_entry,
 978                                                 common);
 979                         vid = tt_common_entry->vid;
 980                         last_seen_jiffies = jiffies - tt_local->last_seen;
 981                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 982                         last_seen_secs = last_seen_msecs / 1000;
 983                         last_seen_msecs = last_seen_msecs % 1000;
 984
 985                         no_purge = tt_common_entry->flags & np_flag;
 986
 987                         vlan = batadv_softif_vlan_get(bat_priv, vid);
 988                         if (!vlan) {
 989                                 seq_printf(seq, "Cannot retrieve VLAN %d\n",
 990                                            BATADV_PRINT_VID(vid));
 991                                 continue;
 992                         }
 993
 994                         seq_printf(seq,
 995                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
 996                                    tt_common_entry->addr,
 997                                    BATADV_PRINT_VID(tt_common_entry->vid),
 998                                    ((tt_common_entry->flags &
 999                                      BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1000                                    no_purge ? 'P' : '.',
1001                                    ((tt_common_entry->flags &
1002                                      BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
1003                                    ((tt_common_entry->flags &
1004                                      BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
1005                                    ((tt_common_entry->flags &
1006                                      BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1007                                    ((tt_common_entry->flags &
1008                                      BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1009                                    no_purge ? 0 : last_seen_secs,
1010                                    no_purge ? 0 : last_seen_msecs,
1011                                    vlan->tt.crc);
1012
1013                         batadv_softif_vlan_free_ref(vlan);
1014                 }
1015                 rcu_read_unlock();
1016         }
1017 out:
1018         if (primary_if)
1019                 batadv_hardif_free_ref(primary_if);
1020         return 0;
1021 }
1022
1023 static void
1024 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1025                             struct batadv_tt_local_entry *tt_local_entry,
1026                             u16 flags, const char *message)
1027 {
1028         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1029
1030         /* The local client has to be marked as "pending to be removed" but has
1031          * to be kept in the table in order to send it in a full table
1032          * response issued before the net ttvn increment (consistency check)
1033          */
1034         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1035
1036         batadv_dbg(BATADV_DBG_TT, bat_priv,
1037                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1038                    tt_local_entry->common.addr,
1039                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
1040 }
1041
1042 /**
1043  * batadv_tt_local_remove - logically remove an entry from the local table
1044  * @bat_priv: the bat priv with all the soft interface information
1045  * @addr: the MAC address of the client to remove
1046  * @vid: VLAN identifier
1047  * @message: message to append to the log on deletion
1048  * @roaming: true if the deletion is due to a roaming event
1049  *
1050  * Return: the flags assigned to the local entry before being deleted
1051  */
1052 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1053                            unsigned short vid, const char *message,
1054                            bool roaming)
1055 {
1056         struct batadv_tt_local_entry *tt_local_entry;
1057         u16 flags, curr_flags = BATADV_NO_FLAGS;
1058         struct batadv_softif_vlan *vlan;
1059         void *tt_entry_exists;
1060
1061         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1062         if (!tt_local_entry)
1063                 goto out;
1064
1065         curr_flags = tt_local_entry->common.flags;
1066
1067         flags = BATADV_TT_CLIENT_DEL;
1068         /* if this global entry addition is due to a roaming, the node has to
1069          * mark the local entry as "roamed" in order to correctly reroute
1070          * packets later
1071          */
1072         if (roaming) {
1073                 flags |= BATADV_TT_CLIENT_ROAM;
1074                 /* mark the local client as ROAMed */
1075                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1076         }
1077
1078         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1079                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1080                                             message);
1081                 goto out;
1082         }
1083         /* if this client has been added right now, it is possible to
1084          * immediately purge it
1085          */
1086         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1087
1088         tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
1089                                              batadv_compare_tt,
1090                                              batadv_choose_tt,
1091                                              &tt_local_entry->common);
1092         if (!tt_entry_exists)
1093                 goto out;
1094
1095         /* extra call to free the local tt entry */
1096         batadv_tt_local_entry_free_ref(tt_local_entry);
1097
1098         /* decrease the reference held for this vlan */
1099         vlan = batadv_softif_vlan_get(bat_priv, vid);
1100         if (!vlan)
1101                 goto out;
1102
1103         batadv_softif_vlan_free_ref(vlan);
1104         batadv_softif_vlan_free_ref(vlan);
1105
1106 out:
1107         if (tt_local_entry)
1108                 batadv_tt_local_entry_free_ref(tt_local_entry);
1109
1110         return curr_flags;
1111 }
1112
1113 /**
1114  * batadv_tt_local_purge_list - purge inactive tt local entries
1115  * @bat_priv: the bat priv with all the soft interface information
1116  * @head: pointer to the list containing the local tt entries
1117  * @timeout: parameter deciding whether a given tt local entry is considered
1118  *  inactive or not
1119  */
1120 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1121                                        struct hlist_head *head,
1122                                        int timeout)
1123 {
1124         struct batadv_tt_local_entry *tt_local_entry;
1125         struct batadv_tt_common_entry *tt_common_entry;
1126         struct hlist_node *node_tmp;
1127
1128         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1129                                   hash_entry) {
1130                 tt_local_entry = container_of(tt_common_entry,
1131                                               struct batadv_tt_local_entry,
1132                                               common);
1133                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1134                         continue;
1135
1136                 /* entry already marked for deletion */
1137                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1138                         continue;
1139
1140                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1141                         continue;
1142
1143                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1144                                             BATADV_TT_CLIENT_DEL, "timed out");
1145         }
1146 }
1147
1148 /**
1149  * batadv_tt_local_purge - purge inactive tt local entries
1150  * @bat_priv: the bat priv with all the soft interface information
1151  * @timeout: parameter deciding whether a given tt local entry is considered
1152  *  inactive or not
1153  */
1154 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1155                                   int timeout)
1156 {
1157         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1158         struct hlist_head *head;
1159         spinlock_t *list_lock; /* protects write access to the hash lists */
1160         u32 i;
1161
1162         for (i = 0; i < hash->size; i++) {
1163                 head = &hash->table[i];
1164                 list_lock = &hash->list_locks[i];
1165
1166                 spin_lock_bh(list_lock);
1167                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1168                 spin_unlock_bh(list_lock);
1169         }
1170 }
1171
1172 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1173 {
1174         struct batadv_hashtable *hash;
1175         spinlock_t *list_lock; /* protects write access to the hash lists */
1176         struct batadv_tt_common_entry *tt_common_entry;
1177         struct batadv_tt_local_entry *tt_local;
1178         struct batadv_softif_vlan *vlan;
1179         struct hlist_node *node_tmp;
1180         struct hlist_head *head;
1181         u32 i;
1182
1183         if (!bat_priv->tt.local_hash)
1184                 return;
1185
1186         hash = bat_priv->tt.local_hash;
1187
1188         for (i = 0; i < hash->size; i++) {
1189                 head = &hash->table[i];
1190                 list_lock = &hash->list_locks[i];
1191
1192                 spin_lock_bh(list_lock);
1193                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1194                                           head, hash_entry) {
1195                         hlist_del_rcu(&tt_common_entry->hash_entry);
1196                         tt_local = container_of(tt_common_entry,
1197                                                 struct batadv_tt_local_entry,
1198                                                 common);
1199
1200                         /* decrease the reference held for this vlan */
1201                         vlan = batadv_softif_vlan_get(bat_priv,
1202                                                       tt_common_entry->vid);
1203                         if (vlan) {
1204                                 batadv_softif_vlan_free_ref(vlan);
1205                                 batadv_softif_vlan_free_ref(vlan);
1206                         }
1207
1208                         batadv_tt_local_entry_free_ref(tt_local);
1209                 }
1210                 spin_unlock_bh(list_lock);
1211         }
1212
1213         batadv_hash_destroy(hash);
1214
1215         bat_priv->tt.local_hash = NULL;
1216 }
1217
1218 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1219 {
1220         if (bat_priv->tt.global_hash)
1221                 return 0;
1222
1223         bat_priv->tt.global_hash = batadv_hash_new(1024);
1224
1225         if (!bat_priv->tt.global_hash)
1226                 return -ENOMEM;
1227
1228         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1229                                    &batadv_tt_global_hash_lock_class_key);
1230
1231         return 0;
1232 }
1233
1234 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1235 {
1236         struct batadv_tt_change_node *entry, *safe;
1237
1238         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1239
1240         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1241                                  list) {
1242                 list_del(&entry->list);
1243                 kfree(entry);
1244         }
1245
1246         atomic_set(&bat_priv->tt.local_changes, 0);
1247         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1248 }
1249
1250 /**
1251  * batadv_tt_global_orig_entry_find - find a TT orig_list_entry
1252  * @entry: the TT global entry where the orig_list_entry has to be
1253  *  extracted from
1254  * @orig_node: the originator for which the orig_list_entry has to be found
1255  *
1256  * retrieve the orig_tt_list_entry belonging to orig_node from the
1257  * batadv_tt_global_entry list
1258  *
1259  * Return: it with an increased refcounter, NULL if not found
1260  */
1261 static struct batadv_tt_orig_list_entry *
1262 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1263                                  const struct batadv_orig_node *orig_node)
1264 {
1265         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1266         const struct hlist_head *head;
1267
1268         rcu_read_lock();
1269         head = &entry->orig_list;
1270         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1271                 if (tmp_orig_entry->orig_node != orig_node)
1272                         continue;
1273                 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1274                         continue;
1275
1276                 orig_entry = tmp_orig_entry;
1277                 break;
1278         }
1279         rcu_read_unlock();
1280
1281         return orig_entry;
1282 }
1283
1284 /**
1285  * batadv_tt_global_entry_has_orig - check if a TT global entry is also handled
1286  *  by a given originator
1287  * @entry: the TT global entry to check
1288  * @orig_node: the originator to search in the list
1289  *
1290  * find out if an orig_node is already in the list of a tt_global_entry.
1291  *
1292  * Return: true if found, false otherwise
1293  */
1294 static bool
1295 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1296                                 const struct batadv_orig_node *orig_node)
1297 {
1298         struct batadv_tt_orig_list_entry *orig_entry;
1299         bool found = false;
1300
1301         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1302         if (orig_entry) {
1303                 found = true;
1304                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1305         }
1306
1307         return found;
1308 }
1309
1310 static void
1311 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1312                                 struct batadv_orig_node *orig_node, int ttvn)
1313 {
1314         struct batadv_tt_orig_list_entry *orig_entry;
1315
1316         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1317         if (orig_entry) {
1318                 /* refresh the ttvn: the current value could be a bogus one that
1319                  * was added during a "temporary client detection"
1320                  */
1321                 orig_entry->ttvn = ttvn;
1322                 goto out;
1323         }
1324
1325         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1326         if (!orig_entry)
1327                 goto out;
1328
1329         INIT_HLIST_NODE(&orig_entry->list);
1330         atomic_inc(&orig_node->refcount);
1331         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1332         orig_entry->orig_node = orig_node;
1333         orig_entry->ttvn = ttvn;
1334         atomic_set(&orig_entry->refcount, 2);
1335
1336         spin_lock_bh(&tt_global->list_lock);
1337         hlist_add_head_rcu(&orig_entry->list,
1338                            &tt_global->orig_list);
1339         spin_unlock_bh(&tt_global->list_lock);
1340         atomic_inc(&tt_global->orig_list_count);
1341
1342 out:
1343         if (orig_entry)
1344                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1345 }
1346
1347 /**
1348  * batadv_tt_global_add - add a new TT global entry or update an existing one
1349  * @bat_priv: the bat priv with all the soft interface information
1350  * @orig_node: the originator announcing the client
1351  * @tt_addr: the mac address of the non-mesh client
1352  * @vid: VLAN identifier
1353  * @flags: TT flags that have to be set for this non-mesh client
1354  * @ttvn: the tt version number ever announcing this non-mesh client
1355  *
1356  * Add a new TT global entry for the given originator. If the entry already
1357  * exists add a new reference to the given originator (a global entry can have
1358  * references to multiple originators) and adjust the flags attribute to reflect
1359  * the function argument.
1360  * If a TT local entry exists for this non-mesh client remove it.
1361  *
1362  * The caller must hold orig_node refcount.
1363  *
1364  * Return: true if the new entry has been added, false otherwise
1365  */
1366 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1367                                  struct batadv_orig_node *orig_node,
1368                                  const unsigned char *tt_addr,
1369                                  unsigned short vid, u16 flags, u8 ttvn)
1370 {
1371         struct batadv_tt_global_entry *tt_global_entry;
1372         struct batadv_tt_local_entry *tt_local_entry;
1373         bool ret = false;
1374         int hash_added;
1375         struct batadv_tt_common_entry *common;
1376         u16 local_flags;
1377
1378         /* ignore global entries from backbone nodes */
1379         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1380                 return true;
1381
1382         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1383         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1384
1385         /* if the node already has a local client for this entry, it has to wait
1386          * for a roaming advertisement instead of manually messing up the global
1387          * table
1388          */
1389         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1390             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1391                 goto out;
1392
1393         if (!tt_global_entry) {
1394                 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1395                 if (!tt_global_entry)
1396                         goto out;
1397
1398                 common = &tt_global_entry->common;
1399                 ether_addr_copy(common->addr, tt_addr);
1400                 common->vid = vid;
1401
1402                 common->flags = flags;
1403                 tt_global_entry->roam_at = 0;
1404                 /* node must store current time in case of roaming. This is
1405                  * needed to purge this entry out on timeout (if nobody claims
1406                  * it)
1407                  */
1408                 if (flags & BATADV_TT_CLIENT_ROAM)
1409                         tt_global_entry->roam_at = jiffies;
1410                 atomic_set(&common->refcount, 2);
1411                 common->added_at = jiffies;
1412
1413                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1414                 atomic_set(&tt_global_entry->orig_list_count, 0);
1415                 spin_lock_init(&tt_global_entry->list_lock);
1416
1417                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1418                                              batadv_compare_tt,
1419                                              batadv_choose_tt, common,
1420                                              &common->hash_entry);
1421
1422                 if (unlikely(hash_added != 0)) {
1423                         /* remove the reference for the hash */
1424                         batadv_tt_global_entry_free_ref(tt_global_entry);
1425                         goto out_remove;
1426                 }
1427         } else {
1428                 common = &tt_global_entry->common;
1429                 /* If there is already a global entry, we can use this one for
1430                  * our processing.
1431                  * But if we are trying to add a temporary client then here are
1432                  * two options at this point:
1433                  * 1) the global client is not a temporary client: the global
1434                  *    client has to be left as it is, temporary information
1435                  *    should never override any already known client state
1436                  * 2) the global client is a temporary client: purge the
1437                  *    originator list and add the new one orig_entry
1438                  */
1439                 if (flags & BATADV_TT_CLIENT_TEMP) {
1440                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1441                                 goto out;
1442                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1443                                                             orig_node))
1444                                 goto out_remove;
1445                         batadv_tt_global_del_orig_list(tt_global_entry);
1446                         goto add_orig_entry;
1447                 }
1448
1449                 /* if the client was temporary added before receiving the first
1450                  * OGM announcing it, we have to clear the TEMP flag. Also,
1451                  * remove the previous temporary orig node and re-add it
1452                  * if required. If the orig entry changed, the new one which
1453                  * is a non-temporary entry is preferred.
1454                  */
1455                 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1456                         batadv_tt_global_del_orig_list(tt_global_entry);
1457                         common->flags &= ~BATADV_TT_CLIENT_TEMP;
1458                 }
1459
1460                 /* the change can carry possible "attribute" flags like the
1461                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1462                  * client entry
1463                  */
1464                 common->flags |= flags;
1465
1466                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1467                  * one originator left in the list and we previously received a
1468                  * delete + roaming change for this originator.
1469                  *
1470                  * We should first delete the old originator before adding the
1471                  * new one.
1472                  */
1473                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1474                         batadv_tt_global_del_orig_list(tt_global_entry);
1475                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1476                         tt_global_entry->roam_at = 0;
1477                 }
1478         }
1479 add_orig_entry:
1480         /* add the new orig_entry (if needed) or update it */
1481         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1482
1483         batadv_dbg(BATADV_DBG_TT, bat_priv,
1484                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1485                    common->addr, BATADV_PRINT_VID(common->vid),
1486                    orig_node->orig);
1487         ret = true;
1488
1489 out_remove:
1490         /* Do not remove multicast addresses from the local hash on
1491          * global additions
1492          */
1493         if (is_multicast_ether_addr(tt_addr))
1494                 goto out;
1495
1496         /* remove address from local hash if present */
1497         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1498                                              "global tt received",
1499                                              flags & BATADV_TT_CLIENT_ROAM);
1500         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1501
1502         if (!(flags & BATADV_TT_CLIENT_ROAM))
1503                 /* this is a normal global add. Therefore the client is not in a
1504                  * roaming state anymore.
1505                  */
1506                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1507
1508 out:
1509         if (tt_global_entry)
1510                 batadv_tt_global_entry_free_ref(tt_global_entry);
1511         if (tt_local_entry)
1512                 batadv_tt_local_entry_free_ref(tt_local_entry);
1513         return ret;
1514 }
1515
1516 /**
1517  * batadv_transtable_best_orig - Get best originator list entry from tt entry
1518  * @bat_priv: the bat priv with all the soft interface information
1519  * @tt_global_entry: global translation table entry to be analyzed
1520  *
1521  * This functon assumes the caller holds rcu_read_lock().
1522  * Return: best originator list entry or NULL on errors.
1523  */
1524 static struct batadv_tt_orig_list_entry *
1525 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1526                             struct batadv_tt_global_entry *tt_global_entry)
1527 {
1528         struct batadv_neigh_node *router, *best_router = NULL;
1529         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1530         struct hlist_head *head;
1531         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1532
1533         head = &tt_global_entry->orig_list;
1534         hlist_for_each_entry_rcu(orig_entry, head, list) {
1535                 router = batadv_orig_router_get(orig_entry->orig_node,
1536                                                 BATADV_IF_DEFAULT);
1537                 if (!router)
1538                         continue;
1539
1540                 if (best_router &&
1541                     bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1542                                        best_router, BATADV_IF_DEFAULT) <= 0) {
1543                         batadv_neigh_node_free_ref(router);
1544                         continue;
1545                 }
1546
1547                 /* release the refcount for the "old" best */
1548                 if (best_router)
1549                         batadv_neigh_node_free_ref(best_router);
1550
1551                 best_entry = orig_entry;
1552                 best_router = router;
1553         }
1554
1555         if (best_router)
1556                 batadv_neigh_node_free_ref(best_router);
1557
1558         return best_entry;
1559 }
1560
1561 /**
1562  * batadv_tt_global_print_entry - print all orig nodes who announce the address
1563  *  for this global entry
1564  * @bat_priv: the bat priv with all the soft interface information
1565  * @tt_global_entry: global translation table entry to be printed
1566  * @seq: debugfs table seq_file struct
1567  *
1568  * This functon assumes the caller holds rcu_read_lock().
1569  */
1570 static void
1571 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1572                              struct batadv_tt_global_entry *tt_global_entry,
1573                              struct seq_file *seq)
1574 {
1575         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1576         struct batadv_tt_common_entry *tt_common_entry;
1577         struct batadv_orig_node_vlan *vlan;
1578         struct hlist_head *head;
1579         u8 last_ttvn;
1580         u16 flags;
1581
1582         tt_common_entry = &tt_global_entry->common;
1583         flags = tt_common_entry->flags;
1584
1585         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1586         if (best_entry) {
1587                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1588                                                  tt_common_entry->vid);
1589                 if (!vlan) {
1590                         seq_printf(seq,
1591                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1592                                    BATADV_PRINT_VID(tt_common_entry->vid),
1593                                    best_entry->orig_node->orig);
1594                         goto print_list;
1595                 }
1596
1597                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1598                 seq_printf(seq,
1599                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1600                            '*', tt_global_entry->common.addr,
1601                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1602                            best_entry->ttvn, best_entry->orig_node->orig,
1603                            last_ttvn, vlan->tt.crc,
1604                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1605                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1606                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1607                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1608
1609                 batadv_orig_node_vlan_free_ref(vlan);
1610         }
1611
1612 print_list:
1613         head = &tt_global_entry->orig_list;
1614
1615         hlist_for_each_entry_rcu(orig_entry, head, list) {
1616                 if (best_entry == orig_entry)
1617                         continue;
1618
1619                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1620                                                  tt_common_entry->vid);
1621                 if (!vlan) {
1622                         seq_printf(seq,
1623                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1624                                    BATADV_PRINT_VID(tt_common_entry->vid),
1625                                    orig_entry->orig_node->orig);
1626                         continue;
1627                 }
1628
1629                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1630                 seq_printf(seq,
1631                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1632                            '+', tt_global_entry->common.addr,
1633                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1634                            orig_entry->ttvn, orig_entry->orig_node->orig,
1635                            last_ttvn, vlan->tt.crc,
1636                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1637                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1638                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1639                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1640
1641                 batadv_orig_node_vlan_free_ref(vlan);
1642         }
1643 }
1644
1645 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1646 {
1647         struct net_device *net_dev = (struct net_device *)seq->private;
1648         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1649         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1650         struct batadv_tt_common_entry *tt_common_entry;
1651         struct batadv_tt_global_entry *tt_global;
1652         struct batadv_hard_iface *primary_if;
1653         struct hlist_head *head;
1654         u32 i;
1655
1656         primary_if = batadv_seq_print_text_primary_if_get(seq);
1657         if (!primary_if)
1658                 goto out;
1659
1660         seq_printf(seq,
1661                    "Globally announced TT entries received via the mesh %s\n",
1662                    net_dev->name);
1663         seq_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
1664                    "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1665                    "CRC", "Flags");
1666
1667         for (i = 0; i < hash->size; i++) {
1668                 head = &hash->table[i];
1669
1670                 rcu_read_lock();
1671                 hlist_for_each_entry_rcu(tt_common_entry,
1672                                          head, hash_entry) {
1673                         tt_global = container_of(tt_common_entry,
1674                                                  struct batadv_tt_global_entry,
1675                                                  common);
1676                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1677                 }
1678                 rcu_read_unlock();
1679         }
1680 out:
1681         if (primary_if)
1682                 batadv_hardif_free_ref(primary_if);
1683         return 0;
1684 }
1685
1686 /**
1687  * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
1688  * @tt_global_entry: the global entry to remove the orig_entry from
1689  * @orig_entry: the orig entry to remove and free
1690  *
1691  * Remove an orig_entry from its list in the given tt_global_entry and
1692  * free this orig_entry afterwards.
1693  *
1694  * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
1695  * part of a list.
1696  */
1697 static void
1698 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1699                                  struct batadv_tt_orig_list_entry *orig_entry)
1700 {
1701         lockdep_assert_held(&tt_global_entry->list_lock);
1702
1703         batadv_tt_global_size_dec(orig_entry->orig_node,
1704                                   tt_global_entry->common.vid);
1705         atomic_dec(&tt_global_entry->orig_list_count);
1706         /* requires holding tt_global_entry->list_lock and orig_entry->list
1707          * being part of a list
1708          */
1709         hlist_del_rcu(&orig_entry->list);
1710         batadv_tt_orig_list_entry_free_ref(orig_entry);
1711 }
1712
1713 /* deletes the orig list of a tt_global_entry */
1714 static void
1715 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1716 {
1717         struct hlist_head *head;
1718         struct hlist_node *safe;
1719         struct batadv_tt_orig_list_entry *orig_entry;
1720
1721         spin_lock_bh(&tt_global_entry->list_lock);
1722         head = &tt_global_entry->orig_list;
1723         hlist_for_each_entry_safe(orig_entry, safe, head, list)
1724                 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1725         spin_unlock_bh(&tt_global_entry->list_lock);
1726 }
1727
1728 /**
1729  * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1730  * @bat_priv: the bat priv with all the soft interface information
1731  * @tt_global_entry: the global entry to remove the orig_node from
1732  * @orig_node: the originator announcing the client
1733  * @message: message to append to the log on deletion
1734  *
1735  * Remove the given orig_node and its according orig_entry from the given
1736  * global tt entry.
1737  */
1738 static void
1739 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1740                                struct batadv_tt_global_entry *tt_global_entry,
1741                                struct batadv_orig_node *orig_node,
1742                                const char *message)
1743 {
1744         struct hlist_head *head;
1745         struct hlist_node *safe;
1746         struct batadv_tt_orig_list_entry *orig_entry;
1747         unsigned short vid;
1748
1749         spin_lock_bh(&tt_global_entry->list_lock);
1750         head = &tt_global_entry->orig_list;
1751         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1752                 if (orig_entry->orig_node == orig_node) {
1753                         vid = tt_global_entry->common.vid;
1754                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1755                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1756                                    orig_node->orig,
1757                                    tt_global_entry->common.addr,
1758                                    BATADV_PRINT_VID(vid), message);
1759                         _batadv_tt_global_del_orig_entry(tt_global_entry,
1760                                                          orig_entry);
1761                 }
1762         }
1763         spin_unlock_bh(&tt_global_entry->list_lock);
1764 }
1765
1766 /* If the client is to be deleted, we check if it is the last origantor entry
1767  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1768  * timer, otherwise we simply remove the originator scheduled for deletion.
1769  */
1770 static void
1771 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1772                              struct batadv_tt_global_entry *tt_global_entry,
1773                              struct batadv_orig_node *orig_node,
1774                              const char *message)
1775 {
1776         bool last_entry = true;
1777         struct hlist_head *head;
1778         struct batadv_tt_orig_list_entry *orig_entry;
1779
1780         /* no local entry exists, case 1:
1781          * Check if this is the last one or if other entries exist.
1782          */
1783
1784         rcu_read_lock();
1785         head = &tt_global_entry->orig_list;
1786         hlist_for_each_entry_rcu(orig_entry, head, list) {
1787                 if (orig_entry->orig_node != orig_node) {
1788                         last_entry = false;
1789                         break;
1790                 }
1791         }
1792         rcu_read_unlock();
1793
1794         if (last_entry) {
1795                 /* its the last one, mark for roaming. */
1796                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1797                 tt_global_entry->roam_at = jiffies;
1798         } else
1799                 /* there is another entry, we can simply delete this
1800                  * one and can still use the other one.
1801                  */
1802                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1803                                                orig_node, message);
1804 }
1805
1806 /**
1807  * batadv_tt_global_del - remove a client from the global table
1808  * @bat_priv: the bat priv with all the soft interface information
1809  * @orig_node: an originator serving this client
1810  * @addr: the mac address of the client
1811  * @vid: VLAN identifier
1812  * @message: a message explaining the reason for deleting the client to print
1813  *  for debugging purpose
1814  * @roaming: true if the deletion has been triggered by a roaming event
1815  */
1816 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1817                                  struct batadv_orig_node *orig_node,
1818                                  const unsigned char *addr, unsigned short vid,
1819                                  const char *message, bool roaming)
1820 {
1821         struct batadv_tt_global_entry *tt_global_entry;
1822         struct batadv_tt_local_entry *local_entry = NULL;
1823
1824         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1825         if (!tt_global_entry)
1826                 goto out;
1827
1828         if (!roaming) {
1829                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1830                                                orig_node, message);
1831
1832                 if (hlist_empty(&tt_global_entry->orig_list))
1833                         batadv_tt_global_free(bat_priv, tt_global_entry,
1834                                               message);
1835
1836                 goto out;
1837         }
1838
1839         /* if we are deleting a global entry due to a roam
1840          * event, there are two possibilities:
1841          * 1) the client roamed from node A to node B => if there
1842          *    is only one originator left for this client, we mark
1843          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1844          *    wait for node B to claim it. In case of timeout
1845          *    the entry is purged.
1846          *
1847          *    If there are other originators left, we directly delete
1848          *    the originator.
1849          * 2) the client roamed to us => we can directly delete
1850          *    the global entry, since it is useless now.
1851          */
1852         local_entry = batadv_tt_local_hash_find(bat_priv,
1853                                                 tt_global_entry->common.addr,
1854                                                 vid);
1855         if (local_entry) {
1856                 /* local entry exists, case 2: client roamed to us. */
1857                 batadv_tt_global_del_orig_list(tt_global_entry);
1858                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1859         } else
1860                 /* no local entry exists, case 1: check for roaming */
1861                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1862                                              orig_node, message);
1863
1864 out:
1865         if (tt_global_entry)
1866                 batadv_tt_global_entry_free_ref(tt_global_entry);
1867         if (local_entry)
1868                 batadv_tt_local_entry_free_ref(local_entry);
1869 }
1870
1871 /**
1872  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1873  *  given originator matching the provided vid
1874  * @bat_priv: the bat priv with all the soft interface information
1875  * @orig_node: the originator owning the entries to remove
1876  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1877  *  removed
1878  * @message: debug message to print as "reason"
1879  */
1880 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1881                                struct batadv_orig_node *orig_node,
1882                                s32 match_vid,
1883                                const char *message)
1884 {
1885         struct batadv_tt_global_entry *tt_global;
1886         struct batadv_tt_common_entry *tt_common_entry;
1887         u32 i;
1888         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1889         struct hlist_node *safe;
1890         struct hlist_head *head;
1891         spinlock_t *list_lock; /* protects write access to the hash lists */
1892         unsigned short vid;
1893
1894         if (!hash)
1895                 return;
1896
1897         for (i = 0; i < hash->size; i++) {
1898                 head = &hash->table[i];
1899                 list_lock = &hash->list_locks[i];
1900
1901                 spin_lock_bh(list_lock);
1902                 hlist_for_each_entry_safe(tt_common_entry, safe,
1903                                           head, hash_entry) {
1904                         /* remove only matching entries */
1905                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1906                                 continue;
1907
1908                         tt_global = container_of(tt_common_entry,
1909                                                  struct batadv_tt_global_entry,
1910                                                  common);
1911
1912                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
1913                                                        orig_node, message);
1914
1915                         if (hlist_empty(&tt_global->orig_list)) {
1916                                 vid = tt_global->common.vid;
1917                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1918                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1919                                            tt_global->common.addr,
1920                                            BATADV_PRINT_VID(vid), message);
1921                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1922                                 batadv_tt_global_entry_free_ref(tt_global);
1923                         }
1924                 }
1925                 spin_unlock_bh(list_lock);
1926         }
1927         clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
1928 }
1929
1930 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1931                                       char **msg)
1932 {
1933         bool purge = false;
1934         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1935         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1936
1937         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1938             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1939                 purge = true;
1940                 *msg = "Roaming timeout\n";
1941         }
1942
1943         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1944             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1945                 purge = true;
1946                 *msg = "Temporary client timeout\n";
1947         }
1948
1949         return purge;
1950 }
1951
1952 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1953 {
1954         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1955         struct hlist_head *head;
1956         struct hlist_node *node_tmp;
1957         spinlock_t *list_lock; /* protects write access to the hash lists */
1958         u32 i;
1959         char *msg = NULL;
1960         struct batadv_tt_common_entry *tt_common;
1961         struct batadv_tt_global_entry *tt_global;
1962
1963         for (i = 0; i < hash->size; i++) {
1964                 head = &hash->table[i];
1965                 list_lock = &hash->list_locks[i];
1966
1967                 spin_lock_bh(list_lock);
1968                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1969                                           hash_entry) {
1970                         tt_global = container_of(tt_common,
1971                                                  struct batadv_tt_global_entry,
1972                                                  common);
1973
1974                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1975                                 continue;
1976
1977                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1978                                    "Deleting global tt entry %pM (vid: %d): %s\n",
1979                                    tt_global->common.addr,
1980                                    BATADV_PRINT_VID(tt_global->common.vid),
1981                                    msg);
1982
1983                         hlist_del_rcu(&tt_common->hash_entry);
1984
1985                         batadv_tt_global_entry_free_ref(tt_global);
1986                 }
1987                 spin_unlock_bh(list_lock);
1988         }
1989 }
1990
1991 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1992 {
1993         struct batadv_hashtable *hash;
1994         spinlock_t *list_lock; /* protects write access to the hash lists */
1995         struct batadv_tt_common_entry *tt_common_entry;
1996         struct batadv_tt_global_entry *tt_global;
1997         struct hlist_node *node_tmp;
1998         struct hlist_head *head;
1999         u32 i;
2000
2001         if (!bat_priv->tt.global_hash)
2002                 return;
2003
2004         hash = bat_priv->tt.global_hash;
2005
2006         for (i = 0; i < hash->size; i++) {
2007                 head = &hash->table[i];
2008                 list_lock = &hash->list_locks[i];
2009
2010                 spin_lock_bh(list_lock);
2011                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2012                                           head, hash_entry) {
2013                         hlist_del_rcu(&tt_common_entry->hash_entry);
2014                         tt_global = container_of(tt_common_entry,
2015                                                  struct batadv_tt_global_entry,
2016                                                  common);
2017                         batadv_tt_global_entry_free_ref(tt_global);
2018                 }
2019                 spin_unlock_bh(list_lock);
2020         }
2021
2022         batadv_hash_destroy(hash);
2023
2024         bat_priv->tt.global_hash = NULL;
2025 }
2026
2027 static bool
2028 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2029                        struct batadv_tt_global_entry *tt_global_entry)
2030 {
2031         bool ret = false;
2032
2033         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2034             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2035                 ret = true;
2036
2037         /* check if the two clients are marked as isolated */
2038         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2039             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2040                 ret = true;
2041
2042         return ret;
2043 }
2044
2045 /**
2046  * batadv_transtable_search - get the mesh destination for a given client
2047  * @bat_priv: the bat priv with all the soft interface information
2048  * @src: mac address of the source client
2049  * @addr: mac address of the destination client
2050  * @vid: VLAN identifier
2051  *
2052  * Return: a pointer to the originator that was selected as destination in the
2053  * mesh for contacting the client 'addr', NULL otherwise.
2054  * In case of multiple originators serving the same client, the function returns
2055  * the best one (best in terms of metric towards the destination node).
2056  *
2057  * If the two clients are AP isolated the function returns NULL.
2058  */
2059 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2060                                                   const u8 *src,
2061                                                   const u8 *addr,
2062                                                   unsigned short vid)
2063 {
2064         struct batadv_tt_local_entry *tt_local_entry = NULL;
2065         struct batadv_tt_global_entry *tt_global_entry = NULL;
2066         struct batadv_orig_node *orig_node = NULL;
2067         struct batadv_tt_orig_list_entry *best_entry;
2068
2069         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2070                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2071                 if (!tt_local_entry ||
2072                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2073                         goto out;
2074         }
2075
2076         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2077         if (!tt_global_entry)
2078                 goto out;
2079
2080         /* check whether the clients should not communicate due to AP
2081          * isolation
2082          */
2083         if (tt_local_entry &&
2084             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2085                 goto out;
2086
2087         rcu_read_lock();
2088         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2089         /* found anything? */
2090         if (best_entry)
2091                 orig_node = best_entry->orig_node;
2092         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
2093                 orig_node = NULL;
2094         rcu_read_unlock();
2095
2096 out:
2097         if (tt_global_entry)
2098                 batadv_tt_global_entry_free_ref(tt_global_entry);
2099         if (tt_local_entry)
2100                 batadv_tt_local_entry_free_ref(tt_local_entry);
2101
2102         return orig_node;
2103 }
2104
2105 /**
2106  * batadv_tt_global_crc - calculates the checksum of the local table belonging
2107  *  to the given orig_node
2108  * @bat_priv: the bat priv with all the soft interface information
2109  * @orig_node: originator for which the CRC should be computed
2110  * @vid: VLAN identifier for which the CRC32 has to be computed
2111  *
2112  * This function computes the checksum for the global table corresponding to a
2113  * specific originator. In particular, the checksum is computed as follows: For
2114  * each client connected to the originator the CRC32C of the MAC address and the
2115  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2116  * together.
2117  *
2118  * The idea behind is that CRC32C should be used as much as possible in order to
2119  * produce a unique hash of the table, but since the order which is used to feed
2120  * the CRC32C function affects the result and since every node in the network
2121  * probably sorts the clients differently, the hash function cannot be directly
2122  * computed over the entire table. Hence the CRC32C is used only on
2123  * the single client entry, while all the results are then xor'ed together
2124  * because the XOR operation can combine them all while trying to reduce the
2125  * noise as much as possible.
2126  *
2127  * Return: the checksum of the global table of a given originator.
2128  */
2129 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2130                                 struct batadv_orig_node *orig_node,
2131                                 unsigned short vid)
2132 {
2133         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2134         struct batadv_tt_common_entry *tt_common;
2135         struct batadv_tt_global_entry *tt_global;
2136         struct hlist_head *head;
2137         u32 i, crc_tmp, crc = 0;
2138         u8 flags;
2139         __be16 tmp_vid;
2140
2141         for (i = 0; i < hash->size; i++) {
2142                 head = &hash->table[i];
2143
2144                 rcu_read_lock();
2145                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2146                         tt_global = container_of(tt_common,
2147                                                  struct batadv_tt_global_entry,
2148                                                  common);
2149                         /* compute the CRC only for entries belonging to the
2150                          * VLAN identified by the vid passed as parameter
2151                          */
2152                         if (tt_common->vid != vid)
2153                                 continue;
2154
2155                         /* Roaming clients are in the global table for
2156                          * consistency only. They don't have to be
2157                          * taken into account while computing the
2158                          * global crc
2159                          */
2160                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2161                                 continue;
2162                         /* Temporary clients have not been announced yet, so
2163                          * they have to be skipped while computing the global
2164                          * crc
2165                          */
2166                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2167                                 continue;
2168
2169                         /* find out if this global entry is announced by this
2170                          * originator
2171                          */
2172                         if (!batadv_tt_global_entry_has_orig(tt_global,
2173                                                              orig_node))
2174                                 continue;
2175
2176                         /* use network order to read the VID: this ensures that
2177                          * every node reads the bytes in the same order.
2178                          */
2179                         tmp_vid = htons(tt_common->vid);
2180                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2181
2182                         /* compute the CRC on flags that have to be kept in sync
2183                          * among nodes
2184                          */
2185                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2186                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2187
2188                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2189                 }
2190                 rcu_read_unlock();
2191         }
2192
2193         return crc;
2194 }
2195
2196 /**
2197  * batadv_tt_local_crc - calculates the checksum of the local table
2198  * @bat_priv: the bat priv with all the soft interface information
2199  * @vid: VLAN identifier for which the CRC32 has to be computed
2200  *
2201  * For details about the computation, please refer to the documentation for
2202  * batadv_tt_global_crc().
2203  *
2204  * Return: the checksum of the local table
2205  */
2206 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2207                                unsigned short vid)
2208 {
2209         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2210         struct batadv_tt_common_entry *tt_common;
2211         struct hlist_head *head;
2212         u32 i, crc_tmp, crc = 0;
2213         u8 flags;
2214         __be16 tmp_vid;
2215
2216         for (i = 0; i < hash->size; i++) {
2217                 head = &hash->table[i];
2218
2219                 rcu_read_lock();
2220                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2221                         /* compute the CRC only for entries belonging to the
2222                          * VLAN identified by vid
2223                          */
2224                         if (tt_common->vid != vid)
2225                                 continue;
2226
2227                         /* not yet committed clients have not to be taken into
2228                          * account while computing the CRC
2229                          */
2230                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2231                                 continue;
2232
2233                         /* use network order to read the VID: this ensures that
2234                          * every node reads the bytes in the same order.
2235                          */
2236                         tmp_vid = htons(tt_common->vid);
2237                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2238
2239                         /* compute the CRC on flags that have to be kept in sync
2240                          * among nodes
2241                          */
2242                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2243                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2244
2245                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2246                 }
2247                 rcu_read_unlock();
2248         }
2249
2250         return crc;
2251 }
2252
2253 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2254 {
2255         struct batadv_tt_req_node *node;
2256         struct hlist_node *safe;
2257
2258         spin_lock_bh(&bat_priv->tt.req_list_lock);
2259
2260         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2261                 hlist_del_init(&node->list);
2262                 kfree(node);
2263         }
2264
2265         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2266 }
2267
2268 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2269                                        struct batadv_orig_node *orig_node,
2270                                        const void *tt_buff,
2271                                        u16 tt_buff_len)
2272 {
2273         /* Replace the old buffer only if I received something in the
2274          * last OGM (the OGM could carry no changes)
2275          */
2276         spin_lock_bh(&orig_node->tt_buff_lock);
2277         if (tt_buff_len > 0) {
2278                 kfree(orig_node->tt_buff);
2279                 orig_node->tt_buff_len = 0;
2280                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2281                 if (orig_node->tt_buff) {
2282                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2283                         orig_node->tt_buff_len = tt_buff_len;
2284                 }
2285         }
2286         spin_unlock_bh(&orig_node->tt_buff_lock);
2287 }
2288
2289 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2290 {
2291         struct batadv_tt_req_node *node;
2292         struct hlist_node *safe;
2293
2294         spin_lock_bh(&bat_priv->tt.req_list_lock);
2295         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2296                 if (batadv_has_timed_out(node->issued_at,
2297                                          BATADV_TT_REQUEST_TIMEOUT)) {
2298                         hlist_del_init(&node->list);
2299                         kfree(node);
2300                 }
2301         }
2302         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2303 }
2304
2305 /**
2306  * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2307  * @bat_priv: the bat priv with all the soft interface information
2308  * @orig_node: orig node this request is being issued for
2309  *
2310  * Return: the pointer to the new tt_req_node struct if no request
2311  * has already been issued for this orig_node, NULL otherwise.
2312  */
2313 static struct batadv_tt_req_node *
2314 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2315                        struct batadv_orig_node *orig_node)
2316 {
2317         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2318
2319         spin_lock_bh(&bat_priv->tt.req_list_lock);
2320         hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2321                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2322                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2323                                           BATADV_TT_REQUEST_TIMEOUT))
2324                         goto unlock;
2325         }
2326
2327         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2328         if (!tt_req_node)
2329                 goto unlock;
2330
2331         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2332         tt_req_node->issued_at = jiffies;
2333
2334         hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2335 unlock:
2336         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2337         return tt_req_node;
2338 }
2339
2340 /**
2341  * batadv_tt_local_valid - verify that given tt entry is a valid one
2342  * @entry_ptr: to be checked local tt entry
2343  * @data_ptr: not used but definition required to satisfy the callback prototype
2344  *
2345  * Return: 1 if the entry is a valid, 0 otherwise.
2346  */
2347 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2348 {
2349         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2350
2351         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2352                 return 0;
2353         return 1;
2354 }
2355
2356 static int batadv_tt_global_valid(const void *entry_ptr,
2357                                   const void *data_ptr)
2358 {
2359         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2360         const struct batadv_tt_global_entry *tt_global_entry;
2361         const struct batadv_orig_node *orig_node = data_ptr;
2362
2363         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2364             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2365                 return 0;
2366
2367         tt_global_entry = container_of(tt_common_entry,
2368                                        struct batadv_tt_global_entry,
2369                                        common);
2370
2371         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2372 }
2373
2374 /**
2375  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2376  *  specified tt hash
2377  * @bat_priv: the bat priv with all the soft interface information
2378  * @hash: hash table containing the tt entries
2379  * @tt_len: expected tvlv tt data buffer length in number of bytes
2380  * @tvlv_buff: pointer to the buffer to fill with the TT data
2381  * @valid_cb: function to filter tt change entries
2382  * @cb_data: data passed to the filter function as argument
2383  */
2384 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2385                                     struct batadv_hashtable *hash,
2386                                     void *tvlv_buff, u16 tt_len,
2387                                     int (*valid_cb)(const void *, const void *),
2388                                     void *cb_data)
2389 {
2390         struct batadv_tt_common_entry *tt_common_entry;
2391         struct batadv_tvlv_tt_change *tt_change;
2392         struct hlist_head *head;
2393         u16 tt_tot, tt_num_entries = 0;
2394         u32 i;
2395
2396         tt_tot = batadv_tt_entries(tt_len);
2397         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2398
2399         rcu_read_lock();
2400         for (i = 0; i < hash->size; i++) {
2401                 head = &hash->table[i];
2402
2403                 hlist_for_each_entry_rcu(tt_common_entry,
2404                                          head, hash_entry) {
2405                         if (tt_tot == tt_num_entries)
2406                                 break;
2407
2408                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2409                                 continue;
2410
2411                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2412                         tt_change->flags = tt_common_entry->flags;
2413                         tt_change->vid = htons(tt_common_entry->vid);
2414                         memset(tt_change->reserved, 0,
2415                                sizeof(tt_change->reserved));
2416
2417                         tt_num_entries++;
2418                         tt_change++;
2419                 }
2420         }
2421         rcu_read_unlock();
2422 }
2423
2424 /**
2425  * batadv_tt_global_check_crc - check if all the CRCs are correct
2426  * @orig_node: originator for which the CRCs have to be checked
2427  * @tt_vlan: pointer to the first tvlv VLAN entry
2428  * @num_vlan: number of tvlv VLAN entries
2429  *
2430  * Return: true if all the received CRCs match the locally stored ones, false
2431  * otherwise
2432  */
2433 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2434                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2435                                        u16 num_vlan)
2436 {
2437         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2438         struct batadv_orig_node_vlan *vlan;
2439         int i, orig_num_vlan;
2440         u32 crc;
2441
2442         /* check if each received CRC matches the locally stored one */
2443         for (i = 0; i < num_vlan; i++) {
2444                 tt_vlan_tmp = tt_vlan + i;
2445
2446                 /* if orig_node is a backbone node for this VLAN, don't check
2447                  * the CRC as we ignore all the global entries over it
2448                  */
2449                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2450                                                    orig_node->orig,
2451                                                    ntohs(tt_vlan_tmp->vid)))
2452                         continue;
2453
2454                 vlan = batadv_orig_node_vlan_get(orig_node,
2455                                                  ntohs(tt_vlan_tmp->vid));
2456                 if (!vlan)
2457                         return false;
2458
2459                 crc = vlan->tt.crc;
2460                 batadv_orig_node_vlan_free_ref(vlan);
2461
2462                 if (crc != ntohl(tt_vlan_tmp->crc))
2463                         return false;
2464         }
2465
2466         /* check if any excess VLANs exist locally for the originator
2467          * which are not mentioned in the TVLV from the originator.
2468          */
2469         rcu_read_lock();
2470         orig_num_vlan = 0;
2471         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
2472                 orig_num_vlan++;
2473         rcu_read_unlock();
2474
2475         if (orig_num_vlan > num_vlan)
2476                 return false;
2477
2478         return true;
2479 }
2480
2481 /**
2482  * batadv_tt_local_update_crc - update all the local CRCs
2483  * @bat_priv: the bat priv with all the soft interface information
2484  */
2485 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2486 {
2487         struct batadv_softif_vlan *vlan;
2488
2489         /* recompute the global CRC for each VLAN */
2490         rcu_read_lock();
2491         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2492                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2493         }
2494         rcu_read_unlock();
2495 }
2496
2497 /**
2498  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2499  * @bat_priv: the bat priv with all the soft interface information
2500  * @orig_node: the orig_node for which the CRCs have to be updated
2501  */
2502 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2503                                         struct batadv_orig_node *orig_node)
2504 {
2505         struct batadv_orig_node_vlan *vlan;
2506         u32 crc;
2507
2508         /* recompute the global CRC for each VLAN */
2509         rcu_read_lock();
2510         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2511                 /* if orig_node is a backbone node for this VLAN, don't compute
2512                  * the CRC as we ignore all the global entries over it
2513                  */
2514                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2515                                                    vlan->vid))
2516                         continue;
2517
2518                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2519                 vlan->tt.crc = crc;
2520         }
2521         rcu_read_unlock();
2522 }
2523
2524 /**
2525  * batadv_send_tt_request - send a TT Request message to a given node
2526  * @bat_priv: the bat priv with all the soft interface information
2527  * @dst_orig_node: the destination of the message
2528  * @ttvn: the version number that the source of the message is looking for
2529  * @tt_vlan: pointer to the first tvlv VLAN object to request
2530  * @num_vlan: number of tvlv VLAN entries
2531  * @full_table: ask for the entire translation table if true, while only for the
2532  *  last TT diff otherwise
2533  *
2534  * Return: true if the TT Request was sent, false otherwise
2535  */
2536 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2537                                   struct batadv_orig_node *dst_orig_node,
2538                                   u8 ttvn,
2539                                   struct batadv_tvlv_tt_vlan_data *tt_vlan,
2540                                   u16 num_vlan, bool full_table)
2541 {
2542         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2543         struct batadv_tt_req_node *tt_req_node = NULL;
2544         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2545         struct batadv_hard_iface *primary_if;
2546         bool ret = false;
2547         int i, size;
2548
2549         primary_if = batadv_primary_if_get_selected(bat_priv);
2550         if (!primary_if)
2551                 goto out;
2552
2553         /* The new tt_req will be issued only if I'm not waiting for a
2554          * reply from the same orig_node yet
2555          */
2556         tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
2557         if (!tt_req_node)
2558                 goto out;
2559
2560         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2561         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2562         if (!tvlv_tt_data)
2563                 goto out;
2564
2565         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2566         tvlv_tt_data->ttvn = ttvn;
2567         tvlv_tt_data->num_vlan = htons(num_vlan);
2568
2569         /* send all the CRCs within the request. This is needed by intermediate
2570          * nodes to ensure they have the correct table before replying
2571          */
2572         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2573         for (i = 0; i < num_vlan; i++) {
2574                 tt_vlan_req->vid = tt_vlan->vid;
2575                 tt_vlan_req->crc = tt_vlan->crc;
2576
2577                 tt_vlan_req++;
2578                 tt_vlan++;
2579         }
2580
2581         if (full_table)
2582                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2583
2584         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2585                    dst_orig_node->orig, full_table ? 'F' : '.');
2586
2587         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2588         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2589                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2590                                  tvlv_tt_data, size);
2591         ret = true;
2592
2593 out:
2594         if (primary_if)
2595                 batadv_hardif_free_ref(primary_if);
2596         if (ret && tt_req_node) {
2597                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2598                 /* hlist_del_init() verifies tt_req_node still is in the list */
2599                 hlist_del_init(&tt_req_node->list);
2600                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2601                 kfree(tt_req_node);
2602         }
2603         kfree(tvlv_tt_data);
2604         return ret;
2605 }
2606
2607 /**
2608  * batadv_send_other_tt_response - send reply to tt request concerning another
2609  *  node's translation table
2610  * @bat_priv: the bat priv with all the soft interface information
2611  * @tt_data: tt data containing the tt request information
2612  * @req_src: mac address of tt request sender
2613  * @req_dst: mac address of tt request recipient
2614  *
2615  * Return: true if tt request reply was sent, false otherwise.
2616  */
2617 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2618                                           struct batadv_tvlv_tt_data *tt_data,
2619                                           u8 *req_src, u8 *req_dst)
2620 {
2621         struct batadv_orig_node *req_dst_orig_node;
2622         struct batadv_orig_node *res_dst_orig_node = NULL;
2623         struct batadv_tvlv_tt_change *tt_change;
2624         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2625         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2626         bool ret = false, full_table;
2627         u8 orig_ttvn, req_ttvn;
2628         u16 tvlv_len;
2629         s32 tt_len;
2630
2631         batadv_dbg(BATADV_DBG_TT, bat_priv,
2632                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2633                    req_src, tt_data->ttvn, req_dst,
2634                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2635
2636         /* Let's get the orig node of the REAL destination */
2637         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2638         if (!req_dst_orig_node)
2639                 goto out;
2640
2641         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2642         if (!res_dst_orig_node)
2643                 goto out;
2644
2645         orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
2646         req_ttvn = tt_data->ttvn;
2647
2648         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2649         /* this node doesn't have the requested data */
2650         if (orig_ttvn != req_ttvn ||
2651             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2652                                         ntohs(tt_data->num_vlan)))
2653                 goto out;
2654
2655         /* If the full table has been explicitly requested */
2656         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2657             !req_dst_orig_node->tt_buff)
2658                 full_table = true;
2659         else
2660                 full_table = false;
2661
2662         /* TT fragmentation hasn't been implemented yet, so send as many
2663          * TT entries fit a single packet as possible only
2664          */
2665         if (!full_table) {
2666                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2667                 tt_len = req_dst_orig_node->tt_buff_len;
2668
2669                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2670                                                               &tvlv_tt_data,
2671                                                               &tt_change,
2672                                                               &tt_len);
2673                 if (!tt_len)
2674                         goto unlock;
2675
2676                 /* Copy the last orig_node's OGM buffer */
2677                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2678                        req_dst_orig_node->tt_buff_len);
2679                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2680         } else {
2681                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2682                  * in the initial part
2683                  */
2684                 tt_len = -1;
2685                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2686                                                               &tvlv_tt_data,
2687                                                               &tt_change,
2688                                                               &tt_len);
2689                 if (!tt_len)
2690                         goto out;
2691
2692                 /* fill the rest of the tvlv with the real TT entries */
2693                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2694                                         tt_change, tt_len,
2695                                         batadv_tt_global_valid,
2696                                         req_dst_orig_node);
2697         }
2698
2699         /* Don't send the response, if larger than fragmented packet. */
2700         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2701         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2702                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2703                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2704                                          res_dst_orig_node->orig);
2705                 goto out;
2706         }
2707
2708         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2709         tvlv_tt_data->ttvn = req_ttvn;
2710
2711         if (full_table)
2712                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2713
2714         batadv_dbg(BATADV_DBG_TT, bat_priv,
2715                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2716                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2717                    full_table ? 'F' : '.', req_ttvn);
2718
2719         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2720
2721         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2722                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2723                                  tvlv_len);
2724
2725         ret = true;
2726         goto out;
2727
2728 unlock:
2729         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2730
2731 out:
2732         if (res_dst_orig_node)
2733                 batadv_orig_node_free_ref(res_dst_orig_node);
2734         if (req_dst_orig_node)
2735                 batadv_orig_node_free_ref(req_dst_orig_node);
2736         kfree(tvlv_tt_data);
2737         return ret;
2738 }
2739
2740 /**
2741  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2742  *  translation table
2743  * @bat_priv: the bat priv with all the soft interface information
2744  * @tt_data: tt data containing the tt request information
2745  * @req_src: mac address of tt request sender
2746  *
2747  * Return: true if tt request reply was sent, false otherwise.
2748  */
2749 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2750                                        struct batadv_tvlv_tt_data *tt_data,
2751                                        u8 *req_src)
2752 {
2753         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2754         struct batadv_hard_iface *primary_if = NULL;
2755         struct batadv_tvlv_tt_change *tt_change;
2756         struct batadv_orig_node *orig_node;
2757         u8 my_ttvn, req_ttvn;
2758         u16 tvlv_len;
2759         bool full_table;
2760         s32 tt_len;
2761
2762         batadv_dbg(BATADV_DBG_TT, bat_priv,
2763                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2764                    req_src, tt_data->ttvn,
2765                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2766
2767         spin_lock_bh(&bat_priv->tt.commit_lock);
2768
2769         my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2770         req_ttvn = tt_data->ttvn;
2771
2772         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2773         if (!orig_node)
2774                 goto out;
2775
2776         primary_if = batadv_primary_if_get_selected(bat_priv);
2777         if (!primary_if)
2778                 goto out;
2779
2780         /* If the full table has been explicitly requested or the gap
2781          * is too big send the whole local translation table
2782          */
2783         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2784             !bat_priv->tt.last_changeset)
2785                 full_table = true;
2786         else
2787                 full_table = false;
2788
2789         /* TT fragmentation hasn't been implemented yet, so send as many
2790          * TT entries fit a single packet as possible only
2791          */
2792         if (!full_table) {
2793                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2794
2795                 tt_len = bat_priv->tt.last_changeset_len;
2796                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2797                                                              &tvlv_tt_data,
2798                                                              &tt_change,
2799                                                              &tt_len);
2800                 if (!tt_len)
2801                         goto unlock;
2802
2803                 /* Copy the last orig_node's OGM buffer */
2804                 memcpy(tt_change, bat_priv->tt.last_changeset,
2805                        bat_priv->tt.last_changeset_len);
2806                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2807         } else {
2808                 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2809
2810                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2811                  * in the initial part
2812                  */
2813                 tt_len = -1;
2814                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2815                                                              &tvlv_tt_data,
2816                                                              &tt_change,
2817                                                              &tt_len);
2818                 if (!tt_len)
2819                         goto out;
2820
2821                 /* fill the rest of the tvlv with the real TT entries */
2822                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2823                                         tt_change, tt_len,
2824                                         batadv_tt_local_valid, NULL);
2825         }
2826
2827         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2828         tvlv_tt_data->ttvn = req_ttvn;
2829
2830         if (full_table)
2831                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2832
2833         batadv_dbg(BATADV_DBG_TT, bat_priv,
2834                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2835                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2836
2837         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2838
2839         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2840                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2841                                  tvlv_len);
2842
2843         goto out;
2844
2845 unlock:
2846         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2847 out:
2848         spin_unlock_bh(&bat_priv->tt.commit_lock);
2849         if (orig_node)
2850                 batadv_orig_node_free_ref(orig_node);
2851         if (primary_if)
2852                 batadv_hardif_free_ref(primary_if);
2853         kfree(tvlv_tt_data);
2854         /* The packet was for this host, so it doesn't need to be re-routed */
2855         return true;
2856 }
2857
2858 /**
2859  * batadv_send_tt_response - send reply to tt request
2860  * @bat_priv: the bat priv with all the soft interface information
2861  * @tt_data: tt data containing the tt request information
2862  * @req_src: mac address of tt request sender
2863  * @req_dst: mac address of tt request recipient
2864  *
2865  * Return: true if tt request reply was sent, false otherwise.
2866  */
2867 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2868                                     struct batadv_tvlv_tt_data *tt_data,
2869                                     u8 *req_src, u8 *req_dst)
2870 {
2871         if (batadv_is_my_mac(bat_priv, req_dst))
2872                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2873         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
2874                                              req_dst);
2875 }
2876
2877 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2878                                       struct batadv_orig_node *orig_node,
2879                                       struct batadv_tvlv_tt_change *tt_change,
2880                                       u16 tt_num_changes, u8 ttvn)
2881 {
2882         int i;
2883         int roams;
2884
2885         for (i = 0; i < tt_num_changes; i++) {
2886                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2887                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2888                         batadv_tt_global_del(bat_priv, orig_node,
2889                                              (tt_change + i)->addr,
2890                                              ntohs((tt_change + i)->vid),
2891                                              "tt removed by changes",
2892                                              roams);
2893                 } else {
2894                         if (!batadv_tt_global_add(bat_priv, orig_node,
2895                                                   (tt_change + i)->addr,
2896                                                   ntohs((tt_change + i)->vid),
2897                                                   (tt_change + i)->flags, ttvn))
2898                                 /* In case of problem while storing a
2899                                  * global_entry, we stop the updating
2900                                  * procedure without committing the
2901                                  * ttvn change. This will avoid to send
2902                                  * corrupted data on tt_request
2903                                  */
2904                                 return;
2905                 }
2906         }
2907         set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2908 }
2909
2910 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2911                                   struct batadv_tvlv_tt_change *tt_change,
2912                                   u8 ttvn, u8 *resp_src,
2913                                   u16 num_entries)
2914 {
2915         struct batadv_orig_node *orig_node;
2916
2917         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2918         if (!orig_node)
2919                 goto out;
2920
2921         /* Purge the old table first.. */
2922         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2923                                   "Received full table");
2924
2925         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2926                                   ttvn);
2927
2928         spin_lock_bh(&orig_node->tt_buff_lock);
2929         kfree(orig_node->tt_buff);
2930         orig_node->tt_buff_len = 0;
2931         orig_node->tt_buff = NULL;
2932         spin_unlock_bh(&orig_node->tt_buff_lock);
2933
2934         atomic_set(&orig_node->last_ttvn, ttvn);
2935
2936 out:
2937         if (orig_node)
2938                 batadv_orig_node_free_ref(orig_node);
2939 }
2940
2941 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2942                                      struct batadv_orig_node *orig_node,
2943                                      u16 tt_num_changes, u8 ttvn,
2944                                      struct batadv_tvlv_tt_change *tt_change)
2945 {
2946         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2947                                   tt_num_changes, ttvn);
2948
2949         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2950                                    batadv_tt_len(tt_num_changes));
2951         atomic_set(&orig_node->last_ttvn, ttvn);
2952 }
2953
2954 /**
2955  * batadv_is_my_client - check if a client is served by the local node
2956  * @bat_priv: the bat priv with all the soft interface information
2957  * @addr: the mac address of the client to check
2958  * @vid: VLAN identifier
2959  *
2960  * Return: true if the client is served by this node, false otherwise.
2961  */
2962 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
2963                          unsigned short vid)
2964 {
2965         struct batadv_tt_local_entry *tt_local_entry;
2966         bool ret = false;
2967
2968         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2969         if (!tt_local_entry)
2970                 goto out;
2971         /* Check if the client has been logically deleted (but is kept for
2972          * consistency purpose)
2973          */
2974         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2975             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2976                 goto out;
2977         ret = true;
2978 out:
2979         if (tt_local_entry)
2980                 batadv_tt_local_entry_free_ref(tt_local_entry);
2981         return ret;
2982 }
2983
2984 /**
2985  * batadv_handle_tt_response - process incoming tt reply
2986  * @bat_priv: the bat priv with all the soft interface information
2987  * @tt_data: tt data containing the tt request information
2988  * @resp_src: mac address of tt reply sender
2989  * @num_entries: number of tt change entries appended to the tt data
2990  */
2991 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2992                                       struct batadv_tvlv_tt_data *tt_data,
2993                                       u8 *resp_src, u16 num_entries)
2994 {
2995         struct batadv_tt_req_node *node;
2996         struct hlist_node *safe;
2997         struct batadv_orig_node *orig_node = NULL;
2998         struct batadv_tvlv_tt_change *tt_change;
2999         u8 *tvlv_ptr = (u8 *)tt_data;
3000         u16 change_offset;
3001
3002         batadv_dbg(BATADV_DBG_TT, bat_priv,
3003                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3004                    resp_src, tt_data->ttvn, num_entries,
3005                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3006
3007         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3008         if (!orig_node)
3009                 goto out;
3010
3011         spin_lock_bh(&orig_node->tt_lock);
3012
3013         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3014         change_offset *= ntohs(tt_data->num_vlan);
3015         change_offset += sizeof(*tt_data);
3016         tvlv_ptr += change_offset;
3017
3018         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3019         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3020                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3021                                       resp_src, num_entries);
3022         } else {
3023                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3024                                          tt_data->ttvn, tt_change);
3025         }
3026
3027         /* Recalculate the CRC for this orig_node and store it */
3028         batadv_tt_global_update_crc(bat_priv, orig_node);
3029
3030         spin_unlock_bh(&orig_node->tt_lock);
3031
3032         /* Delete the tt_req_node from pending tt_requests list */
3033         spin_lock_bh(&bat_priv->tt.req_list_lock);
3034         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3035                 if (!batadv_compare_eth(node->addr, resp_src))
3036                         continue;
3037                 hlist_del_init(&node->list);
3038                 kfree(node);
3039         }
3040
3041         spin_unlock_bh(&bat_priv->tt.req_list_lock);
3042 out:
3043         if (orig_node)
3044                 batadv_orig_node_free_ref(orig_node);
3045 }
3046
3047 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3048 {
3049         struct batadv_tt_roam_node *node, *safe;
3050
3051         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3052
3053         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3054                 list_del(&node->list);
3055                 kfree(node);
3056         }
3057
3058         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3059 }
3060
3061 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3062 {
3063         struct batadv_tt_roam_node *node, *safe;
3064
3065         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3066         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3067                 if (!batadv_has_timed_out(node->first_time,
3068                                           BATADV_ROAMING_MAX_TIME))
3069                         continue;
3070
3071                 list_del(&node->list);
3072                 kfree(node);
3073         }
3074         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3075 }
3076
3077 /**
3078  * batadv_tt_check_roam_count - check if a client has roamed too frequently
3079  * @bat_priv: the bat priv with all the soft interface information
3080  * @client: mac address of the roaming client
3081  *
3082  * This function checks whether the client already reached the
3083  * maximum number of possible roaming phases. In this case the ROAMING_ADV
3084  * will not be sent.
3085  *
3086  * Return: true if the ROAMING_ADV can be sent, false otherwise
3087  */
3088 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3089 {
3090         struct batadv_tt_roam_node *tt_roam_node;
3091         bool ret = false;
3092
3093         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3094         /* The new tt_req will be issued only if I'm not waiting for a
3095          * reply from the same orig_node yet
3096          */
3097         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3098                 if (!batadv_compare_eth(tt_roam_node->addr, client))
3099                         continue;
3100
3101                 if (batadv_has_timed_out(tt_roam_node->first_time,
3102                                          BATADV_ROAMING_MAX_TIME))
3103                         continue;
3104
3105                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3106                         /* Sorry, you roamed too many times! */
3107                         goto unlock;
3108                 ret = true;
3109                 break;
3110         }
3111
3112         if (!ret) {
3113                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3114                 if (!tt_roam_node)
3115                         goto unlock;
3116
3117                 tt_roam_node->first_time = jiffies;
3118                 atomic_set(&tt_roam_node->counter,
3119                            BATADV_ROAMING_MAX_COUNT - 1);
3120                 ether_addr_copy(tt_roam_node->addr, client);
3121
3122                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3123                 ret = true;
3124         }
3125
3126 unlock:
3127         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3128         return ret;
3129 }
3130
3131 /**
3132  * batadv_send_roam_adv - send a roaming advertisement message
3133  * @bat_priv: the bat priv with all the soft interface information
3134  * @client: mac address of the roaming client
3135  * @vid: VLAN identifier
3136  * @orig_node: message destination
3137  *
3138  * Send a ROAMING_ADV message to the node which was previously serving this
3139  * client. This is done to inform the node that from now on all traffic destined
3140  * for this particular roamed client has to be forwarded to the sender of the
3141  * roaming message.
3142  */
3143 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3144                                  unsigned short vid,
3145                                  struct batadv_orig_node *orig_node)
3146 {
3147         struct batadv_hard_iface *primary_if;
3148         struct batadv_tvlv_roam_adv tvlv_roam;
3149
3150         primary_if = batadv_primary_if_get_selected(bat_priv);
3151         if (!primary_if)
3152                 goto out;
3153
3154         /* before going on we have to check whether the client has
3155          * already roamed to us too many times
3156          */
3157         if (!batadv_tt_check_roam_count(bat_priv, client))
3158                 goto out;
3159
3160         batadv_dbg(BATADV_DBG_TT, bat_priv,
3161                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3162                    orig_node->orig, client, BATADV_PRINT_VID(vid));
3163
3164         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3165
3166         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3167         tvlv_roam.vid = htons(vid);
3168
3169         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3170                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3171                                  &tvlv_roam, sizeof(tvlv_roam));
3172
3173 out:
3174         if (primary_if)
3175                 batadv_hardif_free_ref(primary_if);
3176 }
3177
3178 static void batadv_tt_purge(struct work_struct *work)
3179 {
3180         struct delayed_work *delayed_work;
3181         struct batadv_priv_tt *priv_tt;
3182         struct batadv_priv *bat_priv;
3183
3184         delayed_work = container_of(work, struct delayed_work, work);
3185         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3186         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3187
3188         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3189         batadv_tt_global_purge(bat_priv);
3190         batadv_tt_req_purge(bat_priv);
3191         batadv_tt_roam_purge(bat_priv);
3192
3193         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3194                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3195 }
3196
3197 void batadv_tt_free(struct batadv_priv *bat_priv)
3198 {
3199         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3200         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3201
3202         cancel_delayed_work_sync(&bat_priv->tt.work);
3203
3204         batadv_tt_local_table_free(bat_priv);
3205         batadv_tt_global_table_free(bat_priv);
3206         batadv_tt_req_list_free(bat_priv);
3207         batadv_tt_changes_list_free(bat_priv);
3208         batadv_tt_roam_list_free(bat_priv);
3209
3210         kfree(bat_priv->tt.last_changeset);
3211 }
3212
3213 /**
3214  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3215  *  table and possibly count them in the TT size
3216  * @bat_priv: the bat priv with all the soft interface information
3217  * @flags: the flag to switch
3218  * @enable: whether to set or unset the flag
3219  * @count: whether to increase the TT size by the number of changed entries
3220  */
3221 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3222                                       bool enable, bool count)
3223 {
3224         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3225         struct batadv_tt_common_entry *tt_common_entry;
3226         u16 changed_num = 0;
3227         struct hlist_head *head;
3228         u32 i;
3229
3230         if (!hash)
3231                 return;
3232
3233         for (i = 0; i < hash->size; i++) {
3234                 head = &hash->table[i];
3235
3236                 rcu_read_lock();
3237                 hlist_for_each_entry_rcu(tt_common_entry,
3238                                          head, hash_entry) {
3239                         if (enable) {
3240                                 if ((tt_common_entry->flags & flags) == flags)
3241                                         continue;
3242                                 tt_common_entry->flags |= flags;
3243                         } else {
3244                                 if (!(tt_common_entry->flags & flags))
3245                                         continue;
3246                                 tt_common_entry->flags &= ~flags;
3247                         }
3248                         changed_num++;
3249
3250                         if (!count)
3251                                 continue;
3252
3253                         batadv_tt_local_size_inc(bat_priv,
3254                                                  tt_common_entry->vid);
3255                 }
3256                 rcu_read_unlock();
3257         }
3258 }
3259
3260 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3261 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3262 {
3263         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3264         struct batadv_tt_common_entry *tt_common;
3265         struct batadv_tt_local_entry *tt_local;
3266         struct batadv_softif_vlan *vlan;
3267         struct hlist_node *node_tmp;
3268         struct hlist_head *head;
3269         spinlock_t *list_lock; /* protects write access to the hash lists */
3270         u32 i;
3271
3272         if (!hash)
3273                 return;
3274
3275         for (i = 0; i < hash->size; i++) {
3276                 head = &hash->table[i];
3277                 list_lock = &hash->list_locks[i];
3278
3279                 spin_lock_bh(list_lock);
3280                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3281                                           hash_entry) {
3282                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3283                                 continue;
3284
3285                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3286                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3287                                    tt_common->addr,
3288                                    BATADV_PRINT_VID(tt_common->vid));
3289
3290                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3291                         hlist_del_rcu(&tt_common->hash_entry);
3292                         tt_local = container_of(tt_common,
3293                                                 struct batadv_tt_local_entry,
3294                                                 common);
3295
3296                         /* decrease the reference held for this vlan */
3297                         vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
3298                         if (vlan) {
3299                                 batadv_softif_vlan_free_ref(vlan);
3300                                 batadv_softif_vlan_free_ref(vlan);
3301                         }
3302
3303                         batadv_tt_local_entry_free_ref(tt_local);
3304                 }
3305                 spin_unlock_bh(list_lock);
3306         }
3307 }
3308
3309 /**
3310  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3311  *  which have been queued in the time since the last commit
3312  * @bat_priv: the bat priv with all the soft interface information
3313  *
3314  * Caller must hold tt->commit_lock.
3315  */
3316 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3317 {
3318         lockdep_assert_held(&bat_priv->tt.commit_lock);
3319
3320         /* Update multicast addresses in local translation table */
3321         batadv_mcast_mla_update(bat_priv);
3322
3323         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3324                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3325                         batadv_tt_tvlv_container_update(bat_priv);
3326                 return;
3327         }
3328
3329         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3330
3331         batadv_tt_local_purge_pending_clients(bat_priv);
3332         batadv_tt_local_update_crc(bat_priv);
3333
3334         /* Increment the TTVN only once per OGM interval */
3335         atomic_inc(&bat_priv->tt.vn);
3336         batadv_dbg(BATADV_DBG_TT, bat_priv,
3337                    "Local changes committed, updating to ttvn %u\n",
3338                    (u8)atomic_read(&bat_priv->tt.vn));
3339
3340         /* reset the sending counter */
3341         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3342         batadv_tt_tvlv_container_update(bat_priv);
3343 }
3344
3345 /**
3346  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3347  *  have been queued in the time since the last commit
3348  * @bat_priv: the bat priv with all the soft interface information
3349  */
3350 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3351 {
3352         spin_lock_bh(&bat_priv->tt.commit_lock);
3353         batadv_tt_local_commit_changes_nolock(bat_priv);
3354         spin_unlock_bh(&bat_priv->tt.commit_lock);
3355 }
3356
3357 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3358                            unsigned short vid)
3359 {
3360         struct batadv_tt_local_entry *tt_local_entry = NULL;
3361         struct batadv_tt_global_entry *tt_global_entry = NULL;
3362         struct batadv_softif_vlan *vlan;
3363         bool ret = false;
3364
3365         vlan = batadv_softif_vlan_get(bat_priv, vid);
3366         if (!vlan)
3367                 return false;
3368
3369         if (!atomic_read(&vlan->ap_isolation))
3370                 goto out;
3371
3372         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3373         if (!tt_local_entry)
3374                 goto out;
3375
3376         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3377         if (!tt_global_entry)
3378                 goto out;
3379
3380         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3381                 goto out;
3382
3383         ret = true;
3384
3385 out:
3386         batadv_softif_vlan_free_ref(vlan);
3387         if (tt_global_entry)
3388                 batadv_tt_global_entry_free_ref(tt_global_entry);
3389         if (tt_local_entry)
3390                 batadv_tt_local_entry_free_ref(tt_local_entry);
3391         return ret;
3392 }
3393
3394 /**
3395  * batadv_tt_update_orig - update global translation table with new tt
3396  *  information received via ogms
3397  * @bat_priv: the bat priv with all the soft interface information
3398  * @orig_node: the orig_node of the ogm
3399  * @tt_buff: pointer to the first tvlv VLAN entry
3400  * @tt_num_vlan: number of tvlv VLAN entries
3401  * @tt_change: pointer to the first entry in the TT buffer
3402  * @tt_num_changes: number of tt changes inside the tt buffer
3403  * @ttvn: translation table version number of this changeset
3404  */
3405 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3406                                   struct batadv_orig_node *orig_node,
3407                                   const void *tt_buff, u16 tt_num_vlan,
3408                                   struct batadv_tvlv_tt_change *tt_change,
3409                                   u16 tt_num_changes, u8 ttvn)
3410 {
3411         u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3412         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3413         bool full_table = true;
3414         bool has_tt_init;
3415
3416         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3417         has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3418                                &orig_node->capa_initialized);
3419
3420         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3421          * increased by one -> we can apply the attached changes
3422          */
3423         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3424                 /* the OGM could not contain the changes due to their size or
3425                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3426                  * times.
3427                  * In this case send a tt request
3428                  */
3429                 if (!tt_num_changes) {
3430                         full_table = false;
3431                         goto request_table;
3432                 }
3433
3434                 spin_lock_bh(&orig_node->tt_lock);
3435
3436                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3437                                          ttvn, tt_change);
3438
3439                 /* Even if we received the precomputed crc with the OGM, we
3440                  * prefer to recompute it to spot any possible inconsistency
3441                  * in the global table
3442                  */
3443                 batadv_tt_global_update_crc(bat_priv, orig_node);
3444
3445                 spin_unlock_bh(&orig_node->tt_lock);
3446
3447                 /* The ttvn alone is not enough to guarantee consistency
3448                  * because a single value could represent different states
3449                  * (due to the wrap around). Thus a node has to check whether
3450                  * the resulting table (after applying the changes) is still
3451                  * consistent or not. E.g. a node could disconnect while its
3452                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3453                  * checking the CRC value is mandatory to detect the
3454                  * inconsistency
3455                  */
3456                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3457                                                 tt_num_vlan))
3458                         goto request_table;
3459         } else {
3460                 /* if we missed more than one change or our tables are not
3461                  * in sync anymore -> request fresh tt data
3462                  */
3463                 if (!has_tt_init || ttvn != orig_ttvn ||
3464                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3465                                                 tt_num_vlan)) {
3466 request_table:
3467                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3468                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3469                                    orig_node->orig, ttvn, orig_ttvn,
3470                                    tt_num_changes);
3471                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3472                                                tt_vlan, tt_num_vlan,
3473                                                full_table);
3474                         return;
3475                 }
3476         }
3477 }
3478
3479 /**
3480  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3481  * @bat_priv: the bat priv with all the soft interface information
3482  * @addr: the mac address of the client to check
3483  * @vid: VLAN identifier
3484  *
3485  * Return: true if we know that the client has moved from its old originator
3486  * to another one. This entry is still kept for consistency purposes and will be
3487  * deleted later by a DEL or because of timeout
3488  */
3489 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3490                                         u8 *addr, unsigned short vid)
3491 {
3492         struct batadv_tt_global_entry *tt_global_entry;
3493         bool ret = false;
3494
3495         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3496         if (!tt_global_entry)
3497                 goto out;
3498
3499         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3500         batadv_tt_global_entry_free_ref(tt_global_entry);
3501 out:
3502         return ret;
3503 }
3504
3505 /**
3506  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3507  * @bat_priv: the bat priv with all the soft interface information
3508  * @addr: the mac address of the local client to query
3509  * @vid: VLAN identifier
3510  *
3511  * Return: true if the local client is known to be roaming (it is not served by
3512  * this node anymore) or not. If yes, the client is still present in the table
3513  * to keep the latter consistent with the node TTVN
3514  */
3515 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3516                                        u8 *addr, unsigned short vid)
3517 {
3518         struct batadv_tt_local_entry *tt_local_entry;
3519         bool ret = false;
3520
3521         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3522         if (!tt_local_entry)
3523                 goto out;
3524
3525         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3526         batadv_tt_local_entry_free_ref(tt_local_entry);
3527 out:
3528         return ret;
3529 }
3530
3531 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3532                                           struct batadv_orig_node *orig_node,
3533                                           const unsigned char *addr,
3534                                           unsigned short vid)
3535 {
3536         bool ret = false;
3537
3538         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3539                                   BATADV_TT_CLIENT_TEMP,
3540                                   atomic_read(&orig_node->last_ttvn)))
3541                 goto out;
3542
3543         batadv_dbg(BATADV_DBG_TT, bat_priv,
3544                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3545                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3546         ret = true;
3547 out:
3548         return ret;
3549 }
3550
3551 /**
3552  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3553  *  maximum packet size that can be transported through the mesh
3554  * @soft_iface: netdev struct of the mesh interface
3555  *
3556  * Remove entries older than 'timeout' and half timeout if more entries need
3557  * to be removed.
3558  */
3559 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3560 {
3561         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3562         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3563         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3564         bool reduced = false;
3565
3566         spin_lock_bh(&bat_priv->tt.commit_lock);
3567
3568         while (true) {
3569                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3570                 if (packet_size_max >= table_size)
3571                         break;
3572
3573                 batadv_tt_local_purge(bat_priv, timeout);
3574                 batadv_tt_local_purge_pending_clients(bat_priv);
3575
3576                 timeout /= 2;
3577                 reduced = true;
3578                 net_ratelimited_function(batadv_info, soft_iface,
3579                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3580                                          packet_size_max);
3581         }
3582
3583         /* commit these changes immediately, to avoid synchronization problem
3584          * with the TTVN
3585          */
3586         if (reduced)
3587                 batadv_tt_local_commit_changes_nolock(bat_priv);
3588
3589         spin_unlock_bh(&bat_priv->tt.commit_lock);
3590 }
3591
3592 /**
3593  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3594  * @bat_priv: the bat priv with all the soft interface information
3595  * @orig: the orig_node of the ogm
3596  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3597  * @tvlv_value: tvlv buffer containing the gateway data
3598  * @tvlv_value_len: tvlv buffer length
3599  */
3600 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3601                                           struct batadv_orig_node *orig,
3602                                           u8 flags, void *tvlv_value,
3603                                           u16 tvlv_value_len)
3604 {
3605         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3606         struct batadv_tvlv_tt_change *tt_change;
3607         struct batadv_tvlv_tt_data *tt_data;
3608         u16 num_entries, num_vlan;
3609
3610         if (tvlv_value_len < sizeof(*tt_data))
3611                 return;
3612
3613         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3614         tvlv_value_len -= sizeof(*tt_data);
3615
3616         num_vlan = ntohs(tt_data->num_vlan);
3617
3618         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3619                 return;
3620
3621         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3622         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3623         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3624
3625         num_entries = batadv_tt_entries(tvlv_value_len);
3626
3627         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3628                               num_entries, tt_data->ttvn);
3629 }
3630
3631 /**
3632  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3633  *  container
3634  * @bat_priv: the bat priv with all the soft interface information
3635  * @src: mac address of tt tvlv sender
3636  * @dst: mac address of tt tvlv recipient
3637  * @tvlv_value: tvlv buffer containing the tt data
3638  * @tvlv_value_len: tvlv buffer length
3639  *
3640  * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3641  * otherwise.
3642  */
3643 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3644                                              u8 *src, u8 *dst,
3645                                              void *tvlv_value,
3646                                              u16 tvlv_value_len)
3647 {
3648         struct batadv_tvlv_tt_data *tt_data;
3649         u16 tt_vlan_len, tt_num_entries;
3650         char tt_flag;
3651         bool ret;
3652
3653         if (tvlv_value_len < sizeof(*tt_data))
3654                 return NET_RX_SUCCESS;
3655
3656         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3657         tvlv_value_len -= sizeof(*tt_data);
3658
3659         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3660         tt_vlan_len *= ntohs(tt_data->num_vlan);
3661
3662         if (tvlv_value_len < tt_vlan_len)
3663                 return NET_RX_SUCCESS;
3664
3665         tvlv_value_len -= tt_vlan_len;
3666         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3667
3668         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3669         case BATADV_TT_REQUEST:
3670                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3671
3672                 /* If this node cannot provide a TT response the tt_request is
3673                  * forwarded
3674                  */
3675                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3676                 if (!ret) {
3677                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3678                                 tt_flag = 'F';
3679                         else
3680                                 tt_flag = '.';
3681
3682                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3683                                    "Routing TT_REQUEST to %pM [%c]\n",
3684                                    dst, tt_flag);
3685                         /* tvlv API will re-route the packet */
3686                         return NET_RX_DROP;
3687                 }
3688                 break;
3689         case BATADV_TT_RESPONSE:
3690                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3691
3692                 if (batadv_is_my_mac(bat_priv, dst)) {
3693                         batadv_handle_tt_response(bat_priv, tt_data,
3694                                                   src, tt_num_entries);
3695                         return NET_RX_SUCCESS;
3696                 }
3697
3698                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3699                         tt_flag =  'F';
3700                 else
3701                         tt_flag = '.';
3702
3703                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3704                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3705
3706                 /* tvlv API will re-route the packet */
3707                 return NET_RX_DROP;
3708         }
3709
3710         return NET_RX_SUCCESS;
3711 }
3712
3713 /**
3714  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3715  * @bat_priv: the bat priv with all the soft interface information
3716  * @src: mac address of tt tvlv sender
3717  * @dst: mac address of tt tvlv recipient
3718  * @tvlv_value: tvlv buffer containing the tt data
3719  * @tvlv_value_len: tvlv buffer length
3720  *
3721  * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3722  * otherwise.
3723  */
3724 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3725                                                u8 *src, u8 *dst,
3726                                                void *tvlv_value,
3727                                                u16 tvlv_value_len)
3728 {
3729         struct batadv_tvlv_roam_adv *roaming_adv;
3730         struct batadv_orig_node *orig_node = NULL;
3731
3732         /* If this node is not the intended recipient of the
3733          * roaming advertisement the packet is forwarded
3734          * (the tvlv API will re-route the packet).
3735          */
3736         if (!batadv_is_my_mac(bat_priv, dst))
3737                 return NET_RX_DROP;
3738
3739         if (tvlv_value_len < sizeof(*roaming_adv))
3740                 goto out;
3741
3742         orig_node = batadv_orig_hash_find(bat_priv, src);
3743         if (!orig_node)
3744                 goto out;
3745
3746         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3747         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3748
3749         batadv_dbg(BATADV_DBG_TT, bat_priv,
3750                    "Received ROAMING_ADV from %pM (client %pM)\n",
3751                    src, roaming_adv->client);
3752
3753         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3754                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3755                              atomic_read(&orig_node->last_ttvn) + 1);
3756
3757 out:
3758         if (orig_node)
3759                 batadv_orig_node_free_ref(orig_node);
3760         return NET_RX_SUCCESS;
3761 }
3762
3763 /**
3764  * batadv_tt_init - initialise the translation table internals
3765  * @bat_priv: the bat priv with all the soft interface information
3766  *
3767  * Return: 0 on success or negative error number in case of failure.
3768  */
3769 int batadv_tt_init(struct batadv_priv *bat_priv)
3770 {
3771         int ret;
3772
3773         /* synchronized flags must be remote */
3774         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3775
3776         ret = batadv_tt_local_init(bat_priv);
3777         if (ret < 0)
3778                 return ret;
3779
3780         ret = batadv_tt_global_init(bat_priv);
3781         if (ret < 0)
3782                 return ret;
3783
3784         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3785                                      batadv_tt_tvlv_unicast_handler_v1,
3786                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3787
3788         batadv_tvlv_handler_register(bat_priv, NULL,
3789                                      batadv_roam_tvlv_unicast_handler_v1,
3790                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3791
3792         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3793         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3794                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3795
3796         return 1;
3797 }
3798
3799 /**
3800  * batadv_tt_global_is_isolated - check if a client is marked as isolated
3801  * @bat_priv: the bat priv with all the soft interface information
3802  * @addr: the mac address of the client
3803  * @vid: the identifier of the VLAN where this client is connected
3804  *
3805  * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
3806  * otherwise
3807  */
3808 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3809                                   const u8 *addr, unsigned short vid)
3810 {
3811         struct batadv_tt_global_entry *tt;
3812         bool ret;
3813
3814         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3815         if (!tt)
3816                 return false;
3817
3818         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3819
3820         batadv_tt_global_entry_free_ref(tt);
3821
3822         return ret;
3823 }